"Police officials missed checking in on Paul Anthony Ciancia "by a matter of minutes" before a deadly shooting rampage occurred at Los Angeles International Airport, the chairman of the U.S. House Homeland Security Committee said Sunday. Ciancia, who police say shot and killed a Transportation Security Administration screener at LAX, was dropped off at the airport by one of his roommates about 9 a.m. Friday, shortly before the deadly shooting rampage occurred, according to authorities. Around the same time, Los Angeles police officers paid a visit to his apartment in Sun Valley in response to concerns from his family after they received text messages indicating that he wanted to harm himself.... When he entered LAX, Ciancia was wearing dark clothes and a bulletproof vest and had not purchased a ticket. He carried a Smith & Wesson .223-caliber M&P-15 assault rifle, five loaded magazines and a trove of ammunition, Bowdich said."