This image made from video shows unidentified flying objects in the skies over southern Campeche state filmed by Mexican Air Force pilots on March 5, 2004. A videotape made widely available to the news media on Tuesday May 11, 2004, shows the bright objects, some sharp points of light and others like large headlights, moving rapidly in what appears to be a late-evening sky. PHOTO - TASR/AP

MEXICO CITY - The Mexican Air Force has released footage of what a UFO expert said were 11 invisible unidentified flying objects picked up by an infrared camera as they whizzed around a surveillance plane. A long-time believer in flying saucers, journalist Jaime Maussan told a news conference on Tuesday the objects were real and seemed "intelligent" after they at one point changed direction and surrounded the plane chasing them. "They were invisible to the eye but they were there, there is no doubt about it. They had mass, they had energy and they were moving about," he said, after showing a 15-minute video he said the Defense Ministry gave him permission to publicize.

The ministry confirmed to Reuters it had provided the video, filmed by the Air Force on March 5 over the eastern coastal state of Campeche. "We are not alone! This is so weird," one of the pilots can be heard yelling, after the plane's crew switched on an infrared camera to track the objects, first picked up by radar.

Reuters