The deadly rampage left investigators to piece together what motivated Paul Ciancia's hatred toward the agency formed to make air travel safer after the Sept. 11 terrorist attacks. But the attack could ultimately lead to changes in the way airports are patrolled.
Ciancia was shot four times by airport police, including in the mouth, and remains heavily sedated and under 24-hour armed guard at the hospital, a law enforcement official told The Associated Press on Sunday. The official was not authorized to speak publicly on the case and requested anonymity.
The FBI said he had a handwritten letter, stating that he made the conscious decision to try to kill multiple TSA officers and "instill fear in your traitorous minds."
The unemployed motorcycle mechanic who recently moved to Los Angeles from the small, blue-collar town of Pennsville, N.J., had a friend drop him at LAX on Friday just moments before he pulled a .223-caliber assault rifle from his duffel bag and opened fire, killing one TSA officer and wounding three other people, including two more TSA workers.
Officials do not believe that the friend knew of the shooter's plans. Ciancia arrived at the airport in a black Hyundai and was not a ticketed passenger.
Ciancia is charged with murder of a federal officer and committing violence at an international airport, charges that could qualify him for the death penalty. It was not immediately clear when he would make a first court appearance given his medical condition.
In court documents and interviews, authorities spelled out a chilling chain of events, saying Ciancia walked into the airport's Terminal 3, pulled the assault rifle from his duffel bag and fired repeatedly at 39-year-old TSA officer Gerardo I. Hernandez. He went up an escalator, turned back to see Hernandez move and returned to shoot him again, according to surveillance video reviewed by investigators.
He then fired on two other uniformed TSA employees and an airline passenger, who all were wounded, as he moved methodically through the security checkpoint to the passenger gate area before airport police shot him as panicked travelers hid in stores and restaurants.
It wasn't clear why Ciancia targeted TSA officers, but what he left behind indicated he was willing to kill any of them who crossed his path, authorities revealed.
The letter in his duffel bag refers to how Ciancia believed his constitutional rights were being violated by TSA searches and that he's a "pissed-off patriot," upset at former Department of Homeland Security Secretary Janet Napolitano.
"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 official spoke on the condition of anonymity because he was not authorized to speak publicly.
The screed mentioned "fiat currency" and "NWO," possible references to the New World Order, a conspiracy theory that foresees a totalitarian one-world government.
The letter also talked about "how easy it is to get a gun into the airport," the law enforcement official said.
When searched, the suspect had five 30-round magazines, and his bag contained hundreds more rounds in boxes.
The FBI was still looking into Ciancia's past, but investigators said they had not found evidence of previous crimes or any run-ins with the TSA. They said he had never applied for a job with the agency.
Rep. Michael McCaul, R-Texas, chairman of the House Homeland Security Committee, said on CNN's State of the Union on Sunday that Ciancia's actions show how difficult it is to protect travelers at a massive airport such as LAX.
The terminals are open and easily accessible to thousands of people who arrive at large sliding glass doors via a broad ring road that fronts the facility and is designed to move people along quickly.
"It's like a shopping mall outside the perimeter," McCaul said.
TSA Administrator John Pistole said the agency will need to work with each airport's police agency "to see how we'll go about in providing the best possible security."
On Monday, Ciancia's New Jersey relatives offered sympathy to the family of the slain security officer and their hopes for the recovery of other victims. The attorney for the Pennsville, N.J., family, John Jordan, declined to take questions.
The TSA said the other two officers wounded in the attack - James Speer, 54, and Tony Grigsby, 36 - were released from the hospital.
Brian Ludmer, a high school teacher, remained hospitalized. He has to undergo at least one more surgery on his leg and extensive physical therapy, hospital officials said Monday, but his condition was upgraded from fair to good.
Two other people suffered injuries trying to evade the gunman, but were not shot.
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