A strange triangular formation of lights moving at an “incredible speed” has been filmed flying near the River Liffey in Dublin. The footage has left experts thinking it could either be a secret aircraft— or an alien spacecraft.

“The configuration of the lights is unlike any aircraft I’ve ever seen,” the Sun quoted Nick Pope, who used to examine UFO sightings for the MoD, as saying.

“It’s either some secret prototype aircraft or drone, or something considerably more exotic.”

At first all that can be seen are a few glittering stars, but seconds later, the night vision device used for the filming reveals five lights in a triangular pattern, zipping through the sky at mind-boggling speed.

WATCH:

What do you think the bizarre craft is?

UPDATE:

Apparently, the video was not filmed in Dublin, but in Fremont California years ago. It looks like the video above was just re-uploaded.

Hat tip to John and Howard for their comments.