Video footage has been released by the US Navy which shows "unidentified" flying objects (UFOs).
One video shows the infra-red tracking of an oddly-shaped UFO that has audio commentary on it, apparently from the time, including comments such as: "My gosh... look at that thing, dude.
The US Navy videos, one of which dates from November 2004 and two from January 2015, were already in the public domain after unauthorised releases in 2007 and 2017.
They had been confirmed as American military videos previously, but the US Department of Defense (DOD) says it is "releasing the videos in order to clear up any misconceptions by the public on whether or not the footage that has been circulating was real, or whether or not there is more to the videos".
"The aerial phenomena observed in the videos remain characterised as 'unidentified'," they added.
Watch: Fast moving 'unidentified' flying object caught on US Navy videos.
Other footage shows two oblong objects caught on video, again by infra-red sensors.
In one shot, a UFO accelerates quickly and is lost to the sensors.
A former UFO investigator who worked for the Ministry of Defence, Nick Pope, told Forces News: “Well I can’t help but wonder, and I’m not going to be popular with the UFO and conspiracy theory community but what the Pentagon are doing here is the exact opposite of what they normally do on UFOs. Normally it’s all either refuse to comment, or debunk, and it’s all weather balloons and swamp gas.
“So this is so unusual, it does, to me, have the hallmarks of some sort of intelligence operation - a psychological operation, a deception operation, something.
“It’s as if the whole rulebook on UFOs has been thrown out of the window, and that makes me suspicious.”
The US DOD said: "After a thorough review, the department has determined that the authorised release of these unclassified videos does not reveal any sensitive capabilities or systems, and does not impinge on any subsequent investigations of military air space incursions by unidentified aerial phenomena."
The UFOs featured in the videos remain unidentified.
Cover image: NAVAIR.