Law enforcement officers were flooding the airport, authorities said, and terminals 2 and 3 were evacuated.
Tory Belleci of the television show Mythbusters tweeted: “Heard gun shots then everyone starting running for the door. Not sure if anyone was hurt. #LAX.”
TV footage showed dozens of offficers swarming the airport. Images also showed a law enforcement officer being treated by paramedics. He appeared to be alert. Another officer had a bloody hand.
10:18 a.m.: Planes at LAX are on ground stop as shooting investigation continues.