LOS ANGELES (CNN) -- A true explanation of why a gunman unleashed terror at Los Angeles International Airport may lie in the hospital bed of Paul Ciancia. But no secrets are coming out.
The man authorities believe killed a TSA agent and shot three other people Friday was "unresponsive" after airport police shot him to end the carnage, FBI Special Agent in Charge David Bowdich said Saturday.
But even in Ciancia's silence, more details are trickling out about what happened at the bustling airport Friday.
Ciancia walked up to a security checkpoint, fatally shot a TSA officer "at point-blank range," went up an escalator and then came back down to shoot his victim again with an assault rifle, a federal prosecutor said.
That TSA officer, Gerardo Hernandez, later died.
After shooting Hernandez, the gunman continued through the terminal, hitting two other uniformed TSA officers and a passenger with bullets before he was shot by airport police, U.S. Attorney Andre Birotte Jr. said.
Both wounded TSA officers were treated and released from hospitals, but the passenger who was shot in his leg was still being treated Sunday at Ronald Reagan UCLA Medical Center Sunday, according to a hospital statement.
Brian Ludmer "remains in fair condition but faces at least one additional surgery for a fractured leg along with extensive physical therapy," a hospital spokesman said Sunday.
Ludmer, a 29-year-old Lake Forest, Illinois, native, called his mother as he was being admitted to the hospital Friday, his mother told CNN affiliate WBBM-TV .
"He said don't worry, I am going to be OK," she said as she waited at Chicago's O'Hare International Airport for a flight to Los Angeles.
Ludmer teaches stage craft in the theater program at Calabasas HIgh School in Los Angeles County, according to the school's website.
'Conscious decision to kill ... TSA employees'
Ciancia, 23, is now charged with two felony offenses -- murder of a federal officer and commission of violence in an international airport. He remained in critical condition at Ronald Reagan UCLA Medical Center Sunday, the hospital said.
If convicted, Ciancia could face the death penalty or life in prison without parole, the prosecutor said. The U.S. attorney general would decide whether to pursue a death sentence.
The gunman left behind five magazines of ammunition that Los Angeles Mayor Eric Garcetti said "could have literally killed everyone in that terminal."
He also had a note that apparently referred to the New World Order and anti-government claims, a federal law enforcement official said.
It's not clear what gave rise to the references, and federal investigators have found no links to known groups and nothing in the suspect's background to explain them. The New World Order is generally considered to be a conspiracy theory in which people suspect a group of elites is conspiring to form an authoritarian, one-world government.
Bowdich said the handwritten note indicated the suspect made "a conscious decision to kill multiple TSA employees."
"He addressed them (TSA officers) at one point in the letter and stated that he wanted to 'instill fear into their traitorous minds,'" Bowdich said.
In his diatribe, the gunman claimed the TSA treats Americans like terrorists even though all people aren't equally dangerous, a U.S. law enforcement official said.
And near the end of the note was a derogatory reference to Janet Napolitano, the former head of the Department of Homeland Security, which includes TSA, the official said.
Another clue about Ciancia's state of mind came from his family in New Jersey. Family members became concerned in recent days after Ciancia sent his brother and father "angry, rambling" texts venting about the government, living in Los Angeles and his general unhappiness, an intelligence source said.
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