 The 23-year-old gunman charged in a deadly shooting at Los Angeles International Airport told authorities at the scene that he acted alone and had been dropped off at the airport by a friend, a law enforcement official who has been briefed on the investigation told The Associated Press exclusively Sunday. Read the criminal complaint filed against Paul Anthony Ciancia (.pdf) 
 
 The gunman, whom authorities identified as Paul Anthony Ciancia, 23, of Los Angeles, then "began to walk up an escalator, looked back at the wounded officer, who in video appeared to move, and returned to shoot the wounded officer again," the affidavit read. Accused of opening fire inside the Los Angeles airport, Ciancia was determined to lash out at the Transportation Security Administration, saying... (Associated Press) 
 
 John S. Pistole, left, Administrator of Transportation Security Administration and Ana Hernandez, center, wife of TSA agent Gerardo Hernandez, victim at LAX shooting, before a press conference in Porter... (Associated Press) 
 
 ALTERNATE HORIZONTAL CROP - This June, 2013 photo released by the Hernandez family Saturday, Nov. 2, 2013, shows Transportation Security Administration officer Gerardo Hernandez. Hernandez, 39, was shot... (Associated Press) 
 
 Authorities do not believe the friend knew that Paul Ciancia, the man charged in the attack, planned to open fire inside LAX's Terminal 3 just moments later, killing one Transportation Security Administration officer and wounding four others, including two more TSA workers, said the official, who is not authorized to speak publicly about the investigation and requested anonymity. Ciancia, an unemployed motorcycle mechanic who grew up in the small, working-class town of Pennsville, New Jersey, was shot four times and was under a 24-hour armed guard at the hospital, where he remained heavily sedated, the law enforcement official told The Associated Press. He was charged Saturday with two felony offenses -- murder of a federal officer and commission of violence in an international airport. These charges could qualify him for the death penalty or life in prison without parole, U.S. Attorney Andre Birotte Jr. said, adding that the U.S. attorney general would decide whether to seek the death sentence. The alleged shooter who went on a rampage Friday at Los Angeles International Airport approached a Transportation Security Administration checkpoint, pulled a .223-caliber M&P-15 assault rifle from his bag and shot multiple times "at point-blank range" at a uniformed TSA officer, according to a criminal complaint filed Saturday. It wasn't clear why Ciancia targeted TSA officers, but what he left behind made it clear he intended to kill any of them that crossed his path, FBI Agent in Charge David L. Bowdich said. The gunman was carrying a signed, handwritten note in his duffel bag that said he wanted to "instill fear into their traitorous minds," said David Bowdich, special agent in charge of the Counterterrorism Division at the FBI's Los Angeles office. On Saturday, Hernandez's widow briefly addressed reporters, praising her husband as an ever-smiling father of two who came to L.A. from El Salvador at age 15 and joined the TSA three years ago. His family declined to comment and asked for privacy, hospital officials said. 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. He said the agency plans to reassess its policies, though he acknowledged that "we can't guard against all threats and all risks."
– Alleged LAX gunman Paul Ciancia told investigators he had acted alone after being dropped off by a friend in a black Hyundai, a police official tells the AP; that friend, officials believe, didn't know what Ciancia had planned. The accused shooter is currently under heavy sedation—and 24-hour armed guard—in the hospital, after being shot four times, the insider says. Ciancia was charged yesterday with murder of a federal officer and committing violence at an international airport, and he could face the death penalty, the AP notes. Meanwhile, more details of the attack and its aftermath are emerging. After the gunman shot Gerardo Hernandez several times at point-blank range with a .223-caliber M&P-15 assault rifle, he began to walk away—but then, video suggests, Hernandez moved. That's when Ciancia "returned to shoot the wounded officer again," says the criminal complaint filed yesterday, as noted at NBC News. The note he carried—which was similar to a suicide note—made his anti-TSA "intent ... very clear," says an FBI rep, per the Los Angeles Times. The note said he hoped to "instill fear into (TSA workers') traitorous minds," but didn't seek to hurt anyone "innocent." Contrary to prior reports, Ciancia, an out-of-work motorcycle mechanic, wasn't a ticketed passenger, the AP notes. Two other TSA officers injured in the shooting are now out of the hospital.