The suspected gunman in the deadly shooting at Los Angeles International Airport has been charged with murder - and could face the death penalty.
Authorities arrested Paul Ciancia, 23, after Friday's attack, which left security officer Gerardo Hernandez dead and five others hurt.
It is alleged the suspect wounded Mr Hernandez and then returned to shoot him again - the second time fatally.
Suspected gunman Paul Ciancia
As well as murder, Ciancia was also charged with commission of violence at an international airport.
A note allegedly found in the suspect's bag said that he wanted to kill at least one transport officer with his AR-15 semi-automatic rifle and didn't care which one.
"Black, white, yellow, brown, I don't discriminate," the note read, according to a paraphrase by a law enforcement official briefed on the investigation.
The suspect's screed also mentioned "fiat currency" and "NWO," possible references to the New World Order, a conspiracy theory that foresees a one-world government.
Terminal 3, the area where the shooting happened, reopened on Saturday.
The attack caused major disruption to travellers
The Transportation Security Administration (TSA) planned to review its security policies in the wake of the shooting.
Administrator John Pistole did not say if that meant arming officers.
A few more details emerged about Ciancia, who was described as reserved and solitary.
Former classmates barely remember him, and could say little about the young man who moved from New Jersey to Los Angeles less than two years ago.
"He kept to himself and ate lunch alone a lot," a former classmate, David Hamilton, told the Los Angeles Times.
A police officer at Los Angeles airport
"I really don't remember any one person who was close to him .... In four years, I never heard a word out of his mouth."
Ciancia, who was shot four times by airport police, remained in hospital on Saturday, but there was no word on his condition.
He was wounded in the mouth and the leg, authorities said.
On Friday, Ciancia's father called police in New Jersey, worried about his son after the young man sent texts to his family that suggested he might be in trouble.
Ten minutes earlier, police said a suspect walked into the airport, pulled a rifle from a bag and began firing.
When searched by police, the attacker had five 30-round magazines, and the bag contained "hundreds of rounds in 20-round boxes," a law enforcement official said.
Mr Hernandez, 39, was the first TSA official in the agency's 12-year history to be killed in the line of duty.
Allen Cummings, the police chief in the small town where Ciancia grew up, said the texts the suspect's family had received did not mention suicide or hurting others.
The attack at the nation's third-busiest airport caused hundreds flights to be delayed and cancellations nationwide.
Leon Saryan had just passed through security when he gunfire. He fled and as he was cowering in a corner, the shooter approached.
"He looked at me and asked 'TSA?'. I shook my head no, and he continued on down toward the gate. He had his gun at the ready and, but for the grace of God, I am here to tell about it," said Mr Saryan.