A man suspected of carrying out a deadly attack at Los Angeles International Airport sent a suicidal text message to his sibling, police have said.
The alleged gunman shot his way past a screening checkpoint, killing a security officer and wounding three other people before being injured in a shoot-out and taken into custody, authorities said.
The suspect has been identified as 23-year-old Paul Ciancia, who police have said appeared to have a grudge against security services.
His father, who has the same name, called his local police chief around the time of the shooting to report his son had sent the text and he needed to find him, police said.
The elder Paul Ciancia, from Pennsville, New Jersey, telephoned Allen Cummings, telling him one of his children had received the message from the younger Ciancia "in reference to him taking his own life".
At the time, the 23-year-old man was carrying out his shooting using a semi-automatic rifle, authorities said.
The attack caused major disruption to travellers A motive was not clear, but Ciancia was wearing military fatigues and carrying a bag containing a handwritten note that said he "wanted to kill TSA (Transport Security Administration) and pigs," according to a law enforcement official.
The official said the rant referred to how Ciancia believed his constitutional rights were being violated by TSA searches and that he was upset at former Department of Homeland Security Secretary Janet Napolitano.
Ciancia, who managed to enter the secure area of Terminal 3, was reportedly shot in the mouth and leg by two airport police officers.
After getting the call from the suspect's father, Mr Cummings contacted LA police, who sent a patrol car to Ciancia's apartment.
He said: "Basically, there were two roommates there. They said, 'We saw him yesterday and he was fine.'"
A police officer at Los Angeles airport Mr Cummings said his police department had never had dealings with the younger Ciancia.
Neighbour Josh Pagan, 17, said: "He was never weird toward me. He never gave me any weird vibes."
He added that in the 10 years he has lived across the street from the Ciancia family "they've been nothing but nice to us."
The airport attack disrupted more than 700 flights across the US. One witness at LAX, Brian Keech, said he heard "about a dozen gunshots" from inside the security gate.
Travellers described a chaotic scene as security staff evacuated terminals and rushed them outside to the tarmac.
The man who died was named as 39-year-old Gerardo I. Hernandez - the first TSA officer killed in the line of duty in the 12-year history of the agency, founded in the aftermath of 9/11.
Los Angeles Mayor Eric Garcetti praised the response of officers and said: "There were more than 100 more rounds that could have literally killed everybody in that terminal today. Were it not for their actions, it could have been a lot more damage."
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