The US has called off the official search for the UFOs shot down over North American with an official saying they may never be found.

Three flying objects were shot out the sky by the US military last weekend.

White House spokesman John Kirby said they may be "tied to commercial or research entities and therefore benign" but he also said it would be difficult to find the motive or origin behind the three, unless they were recovered.

To read more, click here.