AP) -- The men were air traffic controllers. Experienced, calm professionals. Nobody was drinking. But they were so worried about losing their jobs that they demanded their names be kept off the official report.

No one, they knew, would believe their claim an unidentified flying object landed at the airport they were overseeing in the east of England, touched down briefly, then took off again at tremendous speed. Yet that's what they reported happened at 4 p.m. on April 19, 1984.

The incident is one of hundreds of reported sightings contained in more than 1,000 pages of formerly secret UFO documents being released Wednesday by Britain's National Archives. It is one of the few that was never explained.

"They were absolutely astonished," he said. "It was a bright, circular object, flashing different colors, and after it touched down it disappeared at fantastic speed. The report comes from very qualified people, and it's one of the few that remained unexplained."