Suspect held as 1 shot dead at US airport A gunman with a semi-automatic weapon has shot three people, killing a federal security agent, at the Los Angeles airport, US police say. Flights have been disrupted across the United States. Police said the unidentified suspect, who apparently was injured following an exchange of gunfire with officers, was in custody. The airport was being swept for precautionary measures, and the bomb unit was on scene. Tim Kauffman, a spokesman for the American Federation of Government Employees, confirmed that a Transportation Security Administration officer was killed. He said the union's information came from their local officials in Los Angeles. The gunshots were reported at Terminal 3, which is home to Virgin America and other airlines. Ronald Reagan UCLA Medical Center said it received "three male victims from the LAX Airport shootings. One arrived in critical condition and two are listed in fair condition. Air traffic was affected across the country as the Federal Aviation Administration grounded flights that had not yet departed for LAX. Witness Brian Keech said he heard "about a dozen gunshots" from inside a security gate at the terminal. LAX air traffic controller Michael Foote said his colleagues in the control tower saw passengers spilling from the terminal on to the tarmac, "evacuating the building, getting out as fast as they could." Other travellers described a chaotic scene as airport security staff evacuated terminals. Hundreds of people remained gathered outside next to planes. "People started saying there's a shooter, there's a shooter," said Natalie Morin, who was heading to San Francisco for a graduate school interview.