"As officials continue to investigate 19-year-old Nikolas Cruz, who is accused of opening fire on his former high school Wednesday afternoon, killing at least 17 people and injuring more than a dozen others, familiar details are already emerging about the weapon police believe was used in the massacre. Police suspect Cruz was armed with at least one AR-15-style rifle and “countless magazines” in the deadly shooting at Marjory Stoneman Douglas High School in Parkland, Florida. This adds to a disturbing trend. In many of the most deadly mass shootings in the last several years, including the Las Vegas massacre on Oct. 1 and the shooting at a Texas church on Nov. 5, the lone gunmen were armed with assault-style rifles like the one reportedly used at the Florida school."