Pop. Pop. Pop.
What is that, a number of passengers at Los Angeles International Airport thought? Then came the screams from inside Terminal 3: "A gun! Everybody get down."
By the time the shooting stopped Friday morning, a lone gunman had squeezed off 10 rounds from an assault rifle, according to authorities, killing at least one person and wounding others.
Hours later, with a wounded suspect -- identified by authorities as Paul Anthony Ciancia, 23, of Los Angeles, in custody -- those who survived the shooting rampage painted a terrifying picture of how the attack unfolded:
'Everybody get down'
It was 9:20 a.m. inside the crowded terminal that serves Alaska Airlines, JetBlue, Spirit Airlines, Virgin America, Frontier Airlines and a number of other commercial carriers.
Dana Starfield was one of the hundreds of passenger waiting to clear security or board flights when the gunman, according to police, walked into the terminal, pulled an assault rifle from a bag and starting firing.
Then she heard a "boom."
"We heard someone scream, 'A gun! Everybody get down, get down,'" Starfield told CNN affiliate KCBS.
Many, including Starfield, had cleared one TSA checkpoint, where her ID and boarding pass were checked. She and others dropped to ground, near the security checkpoint.
"We just crawled through the security gate," she said.
Starfield said Virgin America employees guided her and several others into a small room, where they barricaded the door by moving a copy machine in front of it.
"We heard a few more booms," she said.
About 15 minutes later, she estimates, Los Angeles police SWAT officers came through and led them to safety.
The scariest part
Inside the airport, the gunman breached security after shooting and killing a TSA security officer and wounding others, and passengers scrambled to find safety.
Leslie Rockitter was in the women's bathroom inside the terminal when she heard the shots.
Suddenly, men and women were running into the bathroom seeking cover, she told CNN.
More than two dozen people huddled in the bathroom, many of them ducking into stalls -- doing anything to hide.
The scariest part, Rockitter told CNN, was when they heard shots ringing out in the terminal.
"That brief moment, you just had your life flash before you," she said.
Even after the initial burst of gunfire, she and the others remained in the bathroom for fears there may be a second shooter. After about 40 minutes, they were finally let out.
"He said, 'TSA?'"
Passenger Leon Saryan was reaching for his shoes and belt that he had taken off to clear the TSA security checkpoint when he heard shots.
"Everybody kind of hit the ground and started to run," Saryan said on CNN's AC360.