[bots]

The US has shot down another unidentified flying object, this time over Lake Huron near the Canadian border, in what is the fourth such incident this month.

It was downed by Air Force and National Guard pilots on Sunday, Michigan Congresswoman Elissa Slotkin said.

"Great work by all who carried out this mission," she wrote on Twitter.

Washington has been on high alert since its military destroyed a suspected Chinese spy balloon on 4 February.

That balloon was tracked across the continental US before it was shot down off the coast of South Carolina. Officials recovered some of its debris from the ocean and said the balloon originated in China and was used for surveillance - but China denies it was used for spying.

Since then, American fighter jets have shot down three further high-altitude objects in as many days.

On Friday, President Joe Biden ordered an object to be shot down over Alaska. And on Saturday a similar object was shot down over the Yukon in north-west Canada.

Officials have not publicly identified the suspected origin of these objects. Both the US and Canada are working to recover the remnants, but the search in Alaska has been hampered by Arctic conditions.

https://www.bbc.co.uk/news/world-us-canada-64620064