"Especially after the attacks of 9/11, it is no longer satisfactory to ignore radar returns ... which cannot be associated with performances of existing aircraft and helicopters," they said in a statement released at a news conference.

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"It's a question of who you going to believe: your lying eyes or the government?" remarked John Callahan, a former Federal Aviation Administration investigator, who said the CIA in 1987 tried to hush up the sighting of a huge lighted ball four times the size of a jumbo jet in Alaska.