2010s Mass Shootings In The United States

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April 10, 2026

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April 10, 2026

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"Six of the 10 deadliest mass shootings in the U.S. over the past decade have used an AR-15-style semi-automatic rifle. The latest instance was Wednesday’s high school shooting in Parkland, Florida, which left 17 dead and 14 others injured. The gun used in the shooting was a Smith and Wesson M&P AR-15, federal law enforcement officials told the Associated Press. The same model weapon was used in previous mass shootings, including the Aurora, Colo., movie theater shooting that claimed 12 lives and the rampage in San Bernardino, Calif., that claimed 14. These rifles and other versions of the AR-15 are the civilian equivalent of fully-automatic M16 rifles used by the U.S. military since the Vietnam War. They are fancied by gun owners because they are typically easy to purchase — often for less than $1,000 — and can be customized with a number of accessories, such as bump stocks, which essentially convert the semi-automatic weapons into fully-automatics. A bump stock was deployed by the assailant in the 2017 Las Vegas shooting, which left 58 dead, making it the deadliest mass shooting in modern American history. Up until that point, the country’s deadliest mass shooting had occurred just a year prior at the Pulse nightclub in Orlando, where the perpetrator used an SIG MCX semi-automatic rifle — highly similar to AR-15s in aesthetic and purpose — to kill 49 people. Comparable weapons were also used at Sandy Hook Elementary School (27 dead) and a Sutherland Springs, Texas, church (25 dead). The high number of fatalities in these incidents highlight how AR-15-style guns, much like their M16 cousin, are capable of inflicting serious damage to a number of people at once. “For practical purposes, for the person that’s just tuning in, the non-gun owner, it’s a very similar type of firearm,” Rob Pincus, who has made a career out of training armed professionals, told TIME."

- 2017 Las Vegas shooting

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"The nation's mass-shooting problem seems to be getting worse. And the latest, most serious shootings all seem to have one new thing in common: the AR-15 semi-automatic assault rifle. The AR-15 typically has large magazines, shoots rounds at higher velocities than handguns, and leaves more complex wounds in victims. In each one of the older shootings on the 10-deadliest list — including the 2007 attack on Virginia Tech in Blacksburg, Va., that left 32 victims dead — the shooters carried handguns. (The exception is the 1984 San Ysidro massacre, where the gunman also used a shotgun and an Uzi semiautomatic carbine.) But in all of the latest incidents — Newtown, Conn., in 2012; San Bernardino, Calif., in 2015; Orlando, Fla., in 2016; Las Vegas, 2017; Sutherland Springs, Texas, 2017 — the attackers primarily used AR-15 semiautomatic rifles. There are a couple of theories that might suggest why AR-15s would be associated with deadlier attacks. AR-15 rifles shoot small but high-velocity .223-caliber rounds that often shatter inside victims' bodies, creating more devastating injuries than the wounds typically left by larger but lower-velocity handgun rounds. Shooters also commonly use the rifles with 30-round magazines, which allow them to fire more rounds uninterrupted, compared with the smaller magazines commonly used in handguns."

- 2017 Las Vegas shooting

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"24 guns were found in Paddock's rooms at the Mandalay Bay.... Guns found inside Mandalay Bay rooms 32-135 and 32-134: Colt M4 Carbine AR-15 .223/5.56 with a bump stock, vertical fore grip and 100 round magazine. Front sight only. Noveske N4 AR-15 .223/5.56 with a bump stock, vertical fore grip and 40 round magazine. EOTech optic. LWRC M61C AR-15 .223/5.56 with a bump stock, vertical fore grip and 100 round magazine. No sights or optics. POF USA P-308 AR-10 .308/7.62 with a bipod, scope and 25 round magazine Christensen Arms CA-15 AR-15 .223 Wylde with a bump stock, vertical fore grip and 100 round magazine. No sights or optics. POF USA P-15 P AR-15 .223/5.56 with a bump stock, vertical fore grip and 100 round magazine. No sights or optics. Colt Competition AR-15 .223/5.56 with a bump stock, vertical fore grip and 100 round magazine. No sights or optics. Smith & Wesson 342 AirLite .38 caliber revolver with 4 cartridges, 1 expended cartridge case. LWRC M61C AR-15 .223/5.56 with a bump stock, vertical fore grip and 100 round magazine. EOTech optic. FNH FM15 AR-10 .308/7.62 with a bipod, scope and 25 round magazine. Daniel Defense DD5V1 AR-10 .308/7.62 with a bipod, scope and 25 round magazine. FNH FN15 AR-15 .223/5.56 with a bump stock, vertical fore grip and 100 round magazine. EOTech optic. POF USA P15 AR-15 .223/5.56 with a bump stock, vertical fore grip and 100 round magazine. EOTech optic. Colt M4 Carbine AR-15 .223/5.56 with a bump stock, vertical fore grip and 100 round magazine. Daniel Defense M4A1 AR-15 .223/5.56 with a bump stock, vertical fore grip and 100 round magazine. EOTech optic. LMT Def. 2000 AR-15 .223/5.56 with a bump stock, vertical fore grip and 100 round magazine. No sights or optics. Daniel Defense DDM4V11 AR-15 .223/5.56 with a bump stock, vertical fore grip. No magazine. EOTech optic. Sig Sauer SIG716 AR-10 .308/7.62 with a bipod, red dot optic and 25 round magazine. Daniel Defense DD5V1 AR-10 .308/7.62 with a bipod and scope. No magazine. FNH FN15 AR-15 .223/5.56 with a bump stock, vertical fore grip and 100 round magazine. No sights or optics. Ruger American .308 caliber bolt action rifle with scope. LMT LM308MWS AR-10 .308/7.62 with a bipod and red dot scope. No magazine. Ruger SR0762 AR-10 .308/7.62 with a bipod, scope and 25 round magazine. LMT LM308MWS AR-10 with a bipod, scope and 25 round magazine."

- 2017 Las Vegas shooting

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"It’s important to understand how we got where we are today. In 1966, the unthinkable happened: a madman climbed the University of Texas clock tower and opened fire, killing more than a dozen people. It was the first mass shooting in the age of television, and it left a real impression on the country. It was the kind of terror we didn’t expect to ever see again. But around 30 years ago, we started to see an uptick in these types of shootings, and over the last decade they’ve become the new norm. In July 2012, a gunman walked into a darkened theater in Aurora and shot 12 people to death, injuring 70 more. One of his weapons was an assault rifle. The sudden and utterly random violence was a terrifying sign of what was to come. In December 2012, a young man entered an elementary school in Newtown and murdered six educators and 20 young children. One of his weapons was an assault rifle. Watching the aftermath of these young babies being gunned down was heartrending. In June 2016, a gunman entered a nightclub in Orlando and sprayed revelers with gunfire. The shooter fired hundreds of rounds, many in close proximity, and killed 49. Many of the victims were shot in the head at close range. One of his weapons was an assault rifle. Last month, a gunman opened fire on concertgoers in Las Vegas, turning an evening of music into a killing field. All told, the shooter used multiple assault rifles fitted with bump-fire stocks to kill 58 people. The concert venue looked like a warzone. Over the weekend in Sutherland Springs, 26 were killed by a gunman with an assault rifle. The dead ranged from 17 months old to 77 years. No one is spared with these weapons of war. When so many rounds are fired so quickly, no one is spared. Another community devastated and dozens of families left to pick up the pieces. These are just a few of the many communities we talk about in hushed tones—San Bernardino, Littleton, Aurora, towns and cities across the country that have been permanently scarred."

- 2017 Las Vegas shooting

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"AR-15 style rifles have been the weapon of choice in many recent mass shootings, including the Texas church shooting Sunday, the Las Vegas concert last month, the Orlando nightclub last year and Sandy Hook Elementary School in 2012. Here is a list of mass shootings in the U.S. that featured AR-15-style rifles during the last 35 years, courtesy of the Stanford Geospatial Center and Stanford Libraries and USA TODAY research: Feb. 24, 1984: Tyrone Mitchell, 28, used an AR-15, a Stoeger 12-gauge shotgun and a Winchester 12-gauge shotgun to kill two and wound 12 at 49th Street Elementary School in Los Angeles before killing himself. Oct. 7, 2007: Tyler Peterson, 20, used an AR-15 to kill six and injure one at an apartment in Crandon, Wis., before killing himself. June 20, 2012: James Eagan Holmes, 24, used an AR-15-style .223-caliber Smith and Wesson rifle with a 100-round magazine, a 12-gauge Remington shotgun and two .40-caliber Glock semi-automatic pistols to kill 12 and injure 58 at a movie theater in Aurora, Colo. Dec. 14, 2012: Adam Lanza, 20, used an AR-15-style rifle, a .223-caliber Bushmaster, to kill 27 people — his mother, 20 students and six teachers — in Newtown, Conn., before killing himself. June 7, 2013: John Zawahri, 23, used an AR-15-style .223-caliber rifle and a .44-caliber Remington revolver to kill five and injure three at a home in Santa Monica, Calif., before he was killed. March 19, 2015: Justin Fowler, 24, used an AR-15 to kill one and injure two on a street in Little Water, N.M., before he was killed. May 31, 2015: Jeffrey Scott Pitts, 36, used an AR-15 and .45-caliber handgun to kill two and injure two at a store in Conyers, Ga., before he was killed. Oct. 31, 2015: Noah Jacob Harpham, 33, used an AR-15, a .357-caliber revolver and a 9mm semi-automatic pistol to kill three on a street in Colorado Springs, Colo., before he was killed. Dec. 2, 2015: Syed Rizwyan Farook and Tashfeen Malik, 28 and 27, used two AR-15-style, .223-caliber Remington rifles and two 9 mm handguns to kill 14 and injure 21 at his workplace in San Bernardino, Calif., before they were killed. June 12, 2016: Omar Mateen, 29, used an AR-15 style rifle (a Sig Sauer MCX), and a 9mm Glock semi-automatic pistol to kill 49 people and injure 50 at an Orlando nightclub before he was killed. Oct. 1, 2017: Stephen Paddock, 64, used a stockpile of guns including an AR-15 to kill 58 people and injure hundreds at a music festival in Las Vegas before he killed himself. Nov. 5, 2017: Devin Kelley, 26, used an AR-15 style Ruger rifle to kill 26 people at a church in Sutherland Springs, Texas, before he was killed. Feb. 14, 2018: Police say Nikolas Cruz, 19, used an AR-15-style rifle to kill at least 17 people at Marjory Stoneman Douglas High School in Parkland, Fla."

- 2017 Las Vegas shooting

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"A Transportation Security Administration officer killed at Los Angeles International Airport during a rampage three weeks ago was shot 12 times, with bullets piercing organs, grazing his heart and severing a major artery, according to a final autopsy report released Friday. Gerardo I. Hernandez, 39, died within two to five minutes of the Nov. 1 attack inside Terminal 3. The gunman, identified by authorities as Paul Anthony Ciancia, 23, targeted TSA agents during the shooting, the Los Angeles County coroner's office said earlier this week. Hernandez, a married father of two from Porter Ranch, was shot through his right arm, torso, waist, hip, back, buttock and groin by the gunman's semiautomatic rifle, according to the 22-page autopsy report. Many of the shots were fired into the back of the unarmed agent, who became the nation's first TSA officer to be killed in the line of duty. Authorities say Ciancia entered the terminal about 9:30 a.m., pulled his rifle out of a bag and fired at Hernandez. The gunman walked up an escalator, then returned to shoot Hernandez again, U.S. Atty. Andre Birotte has said. The coroner's report described extensive injuries to many of Hernandez's vital internal organs. The autopsy noted Hernandez suffered "a complete transection of the abdominal aorta distal to superior mesenteric artery" and extensive damage to his spinal cord. Hernandez suffered 16 wounds to his gastrointestinal tract. Many of the rounds lodged in his body, the report noted. Medical examiners recovered 40 bullet fragments, which were given to the FBI as evidence, according to the report. Two other TSA officers and a schoolteacher were wounded before Ciancia was shot and critically wounded by two airport police officers. In Ciancia's possessions, FBI agents recovered a Smith & Wesson .223-caliber rifle as well as notes expressing his hatred for the TSA and the government in general."

- 2013 Los Angeles International Airport shooting

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"The gun used by the government-hater to kill a checkpoint screener and wound three others? It was the type of firearm that would have been banned from the California market under legislation vetoed by Gov. Jerry Brown. Not that it would have mattered for Gerardo Hernandez, 39, the TSA agent who was murdered. The bill would not have taken effect until Jan. 1. And Paul Anthony Ciancia, 23, the disgruntled, alleged assassin, could have kept his semiautomatic rifle by registering it. And, yes, he also could have armed himself with a handgun and probably inflicted the same damage. But presumably he chose the Smith & Wesson M&P 15, .223-caliber semiautomatic — hauling with him five loaded detachable magazines and a trove of ammunition — because he had in mind creating even more mayhem. Such military-style assault rifles, after all, are the weapons of choice for mass killers. Ciancia was stopped only when critically wounded by LAX police. SB 374, by Senate leader Darrell Steinberg (D-Sacramento), would have banned the sale of most semiautomatic rifles capable of accepting detachable magazines. The aim was to close a loophole used by gun manufacturers to circumvent California's ban on assault weapons. Because of Brown's veto, these especially lethal firearms are still available for purchase in California. And they'll continue to be used by wackos in horrific shootings."

- 2013 Los Angeles International Airport shooting

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"Sanders: I have a D minus voting record, from the NRA. I lost an election probably, for congress here in Vermont back in 1988, because I believe we should not be selling or distributing assault weapons in this country. I am on record and have been for a very long time in saying we have got to significantly tighten up the background checks. We have to end the absurdity of the gun show loophole. 40 percent of the guns in this country are sold without any background checks. We have to deal with the straw man provision which allows people to legally buy guns and then distribute. We’ve got to take on the NRA. And that is my view. And I am, will do everything I can to—the tragedy that we saw in Parkland is unspeakable. And all over this country, parents are scared to death of what might happen when they send their kids to school. This problem is not going to be easily solved. Nobody has a magic solution, alright, but we’ve got to do everything we can do protect the children— Todd: What does that mean? You say everything we can. Does that mean raising the age when you can purchase an AR-15? Does that mean limiting the purchase of AR-15s? Sanders: Yes! Yeah, look. Chuck, what I just told you is that for 30 years, I believe that we should not be selling assault weapons in this country. These weapons are not for hunting, they are for killing human beings. These are military weapons. I do not know why we have five million of them running around the United States of America, so of course we have to do that. Of course we have to make it harder for people to purchase weapons. We have people now who are on terrorist watch lists who can purchase a weapon. Does this make any sense to anybody. Bottom line here, Republicans are going to have to say that it’s more important to protect the children of this country than to antagonize the NRA. Are they prepared to do that, I surely hope they are."

- Stoneman Douglas High School shooting

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