The man accused of opening fire at Los Angeles International Airport, killing an airport security officer and wounding three other people, could face the death penalty after being charged with murder. Paul Anthony Ciancia, 23, was charged with murder of a federal officer and committing violence at an international airport, US Attorney Andre Birotte said, a day after the shooting that sparked panic and chaos at the world's sixth busiest airport. "It will be the decision of the attorney general of the United States whether or not to seek the death penalty in this case," the prosecutor added. Ciancia carried a signed note where he made a conscious decision to kill multiple Transportation Security Administration employees during his rampage at the airport's Terminal 3, FBI special agent in charge David Bowdich said. "He addressed them at one point in the letter and said that he wanted to 'instil fear into their traitorous minds'," Bowdich said. Ciancia was dropped off at the airport, he said, declining to say if the FBI knew who drove the suspected gunman there. Ciancia was "unresponsive" in a hospital on Saturday, with investigators unable to interview him. Flights were grounded, delayed or diverted, with more than 167,000 arriving and departing passengers seeing disruption to their itineraries on Friday. Cathay Pacific flight CX885 from Los Angeles to Hong Kong was delayed for almost 14 hours. It arrived at Hong Kong at 8.06am yesterday. A total of 237 passengers were affected.