A cluster of small earthquakes near Area 51 in Nevada has triggered speculation online, with some linking the tremors to secret military or nuclear tests, though the site is historically known for aircraft testing and not confirmed for such activities.

'Nuclear test' or 'UFO'? Earthquakes rock Area 51 amid US-Iran war: What's happening

Did Donald Trump just promise to reveal UFO secrets? At a Phoenix event, he said classified files on unidentified aerial phenomena will be declassified soon.

What’s really in these documents and why now? Scroll down to read more.

Trump announces Pentagon UFO files release: 'We found many very interesting documents'

The more prosaic answer is that the resemblance stems from aerodynamics and stealth physics that engineers had been chasing since the 1940s.

Reverse-engineering or time travel? The B-2 bomber’s striking resemblance to 1950s UFO sightings

What he claimed to have seen there was staggering: nine fully intact flying saucers of extraterrestrial origin, hidden away from the public.

Did the US really hide nine alien saucers at Area 51? Bob Lazar says yes!

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'Nuclear test' or 'UFO'? Earthquakes rock Area 51 amid US-Iran war: What's happening

Trump announces UFO files release: 'We found many very interesting documents'

The B-2 bomber’s striking resemblance to 1950s UFO sightings

Did the US really hide nine alien saucers at Area 51? Bob Lazar says yes!