The suspected gunman in last week's deadly attack at Los Angeles International Airport wrote a note saying he intended to die.
He killed at least one security officer,the chairman of the US House Committee on Homeland Security said today.
Paul Anthony Ciancia also discussed weaknesses in airport security in the "suicide" note before Friday's attack.
The 23-year-old is accused of fatally shooting a Transportation Security Administration officer, the first employee from the agency to die in the line of duty since it was created 12 years ago.
Airport police shot and wounded the gunman, ending the incident.
The note reportedly "talks a lot about killing TSA agents, and the alleged gunman wrote "If I just kill one, my mission is accomplished.'"
In a criminal complaint filed yesterday, investigators said they found a handwritten letter signed by Mr Ciancia in his bag.
The note addressed TSA officials, writing that he wanted to"instill fear in your traitorous minds."
Authorities charge that Mr Ciancia walked into the airport's Terminal 3 on Friday morning, took out an assault rifle from his bag and opened fire, shooting dead Gerardo Hernandez, 39, a TSA officer at a document checkpoint.
Mr Ciancia, authorities say, then went on to shoot and wound two other TSA employees and a passenger, prompting a panicked evacuation of the world's sixth-busiest airport.
The US attorney in Los Angeles has charged Mr Ciancia with murdering a federal officer.
He is also charged with committing violence at an international airport, crimes that carry the threat of execution if Mr Ciancia is convicted.
Mr Ciancia's father, who lives in Pennsville Township, New Jersey, called local police before the shooting.
Mr Ciancia, who moved to California 18 months ago and lives in suburban Los Angeles, sent his brother a worrisome text message.
Police in Pennsville contacted Los Angeles police, who then visited the suspect's home the morning of the shooting and missed him by about 45 minutes.
A spokeswoman for the Los Angeles Police Department said today she was unable to confirm or deny these details.
In a message on Twitter, the Los Angeles Airport Police Division warned passengers to expect delays today as the airport returns to "full operations."