An employee has been arrested in connection with dry ice explosions at Los Angeles International Airport after police stepped up patrols and increased checks on staff.
Bennett Dicarlo, a 28-year-old employee for the ground handling company Servisair, was arrested for possession of a destructive device near an aircraft. He was being held on 1 million US dollars (£624,000) bail.
Police had previously said they did not believe the explosions were an act of terror because of the locations of the devices and because people were not targeted.
One device exploded in an employee toilet on Sunday night in Terminal 2. Remnants of an exploded bottle were also found that night on the tarmac area near the Tom Bradley International Terminal, but an employee threw it away. The same employee found an unexploded bottle on Monday evening and then reported what he had found the previous day.
The incidents could be the work of a disgruntled employee due to an internal labour dispute, said Los Angeles Police Department Deputy Chief Michael Downing, who heads the department's counter-terrorism and special operations bureau.
No-one was injured in either incident, although some flights were delayed on Sunday.
Swissport has recently agreed to acquire Servisair and the transaction is expected to close by the end of the year.
The bombs could have caused serious injury to anyone in close proximity, Mr Downing said.
While there are cameras in some of the restricted-access areas, Mr Downing said there is not as much camera coverage as in the public areas and investigators had been reviewing available video.