Congress held a landmark hearing on UFOs which saw spy chiefs grilled by lawmakers - but not every question was answered.
Intelligence officials repeatedly said they would have to wait for the classified section of the briefing or sometimes said they could not answer due to a lack of data.
Ronald S Moultrie, under secretary of defence for intelligence and security, and Scott W. Bray, deputy director of naval intelligence, answered questions from lawmakers on the highly controversial topic.
Security officials were forced to admit there have been 400 unexplained sightings reported by the US military - up from the 144 which were revealed last year in the Pentagon report published last June.
They also confessed there have been 11 near misses with unidentified objects and US military aircraft - and they showed two UFO videos, including one that had never been seen before, during the session.
UFOs have taken centre stage in Washington DC in a turnaround which has seen a traditionally fringe topic treated as a national security concern.
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