Three people, including a TSA officer, have been shot at Los Angeles International Airport and a suspect is in custody, police told ABC News.
Police were trying to determine whether there could be a second gunman.
The shooting took place inTerminal 3, TSA confirmed to ABC. The shooting sent hundreds of passengers streaming out of the terminal with many fleeing onto the airport runway.
Three people were wounded and one was identified as a TSA agent.
The gunman, police said, was "neutralized."
The LAPD said it was on "tactical alert due to a major incident" at the airport and the fire department said they were assisting at a multi-patient incident.
At least two people were seen being transported into ambulances.
No planes are flying in or out of the airport.
An eyewitness, Leon Saryan, told ABC News Radio that a "fairly young" gunman with a rifle came down a corridor in Terminal 3 and shot perhaps 20 times.
A TSA officer holding Saryan's shoes was shot and wounded, he told ABC.
Saryan said the gunman asked him, "Are you TSA?"
"He saw me. He looked at me with a quizzical look and said, 'TSA?' And I just shook my head. So he moved on," Saryan said.
Terry Malloy, who was in the airport at the time of the shooting, told ABC News she heard at least three shots fired.
"I was sitting there, and I heard the alarm go off like when the door opens. I saw all these people charging down this ramp going in a million different directions. Everyone started looking at each other (like) what are we going to do, and I saw the ticket agent go behind the counter, and then I heard shots," Malloy said.
"I ran out to one of the piers," she said. "Someone opened one of the doors, and then we literally ran right onto the runway. We saw airport police charging down the runway with their doors open," he said.
This is a breaking news story. Check back for updates.