A video of an unidentified flying object (UFO) emerging from an undisclosed water body has fuelled alien theories all over again.

The Scientific Coalition for Ufology (SCU), a group that investigates and reports unexplained flying objects and aliens, has claimed that the video is "one of the most valid UFO sightings", and was captured by the US Department of Homeland Security.

According to the self-proclaimed organisation of UFO experts, the suspected flying object rose from the sea and "split in to two spacecrafts, while hovering over an undisclosed area". SCU also explained that no flying "thing", including a bird, drone or a balloon can split into two and still continue at the same flying speed.

SCU has claimed that the object was travelling at around 90mph (144kms) beneath the ocean and at around 120mph after emerging from the water body.

In the video, which researchers said they received from "official sources", the characteristics exhibited cannot be explained by "any known aircraft or natural phenomenon". Moreover, the researchers have stated that the US government "is trying to cover up the sighting, captured by the DHS aircraft", reports said.

Nick Pope, the former head of the British Government's UFO project told The Express that the video is unlikely to be that of a UFO or alien hoax.

"Assuming the video isn't a clever hoax – which is always a possibility these days – it's a fascinating piece of footage. About the only conventional explanation that might fit the bill is that this is some new drone, but the entry and exit from the sea and the apparent splitting in two of the object makes even this explanation seem unlikely," Pope said.