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pcl coach lines supervisor, when he decided to make the dry ice bombs Sunday night, a law enforcement official briefed on the investigation told The Associated Press. Investigators believe the bombs were set "out of a desire to construct and experience a device exploding," said Los Angeles police Lt. John Karle. He called it foolish and negligent behavior. Police primarily relied on interviews with witnesses and physical evidence but also reviewed surveillance video. Cameras cover some of these restricted access areas, but Downing said there isn't as much camera coverage as in the public access areas. The union representing police at LAX said the incident highlights the need for the installation of more security cameras at the airport. The bombs were made by putting dry ice in 20 ounce plastic bottles. When the bottle is sealed, pressure builds up as the solid carbon dioxide turns into gas, causing the bottle to burst. The LAX explosions recalled a May incident at Disneyland in which police said an employee placed dry ice packed bottles in a food cart and trash can. Both exploded; no one was injured. Los Angeles police Detective Paul Robi, who is on the bomb squad, emphasized Wednesday that building dry ice