The UFOs, as they were captured by air force cameras / AP

The air force pilots are heard expressing amazement on the tape.

A frame-by-frame analysis shows 16 UFOs, according to the network.

Televisa said the film was taken with an infrared camera and there are no alterations.

``It is one of the most important film documents we have been able to access, especially because it comes from an official source,'' said Jaime Mausan, a journalist who has been tracking the UFO phenomenon for more than 25 years.

The daily La Jornada on Tuesday however dismissed the brouhaha as nothing more than "circus".

On January 31, two Mexican air force photographers said they videotaped what they believed were eight UFOs that overflew Mexico City and the city's international airport for several hours.

STORIES IN THIS SECTION
Hostage beheaded on camera
UFOs filmed over Mexico
Saddam to be handed to Iraqis
France turns screws on imams
Putin in flash trip to Chechnya
Factory blast claims four lives
Pedophile jailed for 13 years
Sydney man on trial for terror
Iraq abuses widespread: Red Cross
Vote-rigging fears in Manila
Gandhis stage political comeback
Danes go wild for all things Aussie
Danish lilt ousts Mary's Aussie accent

HAVE YOUR SAY We welcome your comments on this story. Comments are submitted for possible publication on the condition that they may be edited. Please provide your full name and suburb/location. We also require a working e-mail address – not for publication, but for verification. The telephone field is optional. Fill in the form below and click on the submit button. Full name: Location: E-mail address: Telephone (optional):       Your comment: