The bombshell Pentagon report on Unidentified Aerial Phenomena (UAP) will include a classified annex which is likely to withhold details of "experimental aircraft", a university academic has said.

More UFO videos have been leaked by military personnels since the US Department of Defense officially three classified videos of UAP last April.

The new videos include a "trans-medium" craft that can descend 150mph into water within seconds and a pyramid-shaped UFO hovering above USS Russell in 2019.

The final report – to be released to Congress by June 25 – is expected to provide a possible explanation that the UAPs were top-secret hypersonic weapons developed by adversaries Russia and China, reported the New York Times.

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