Republican presidential hopeful Donald Trump is postponing announcing his pick for running mate, which had been scheduled for Friday, following a Nice attack that has left at least 60 dead.

"In light of the horrible attack in Nice, France, I have postponed tomorrow's news conference concerning my Vice Presidential announcement" Trump posted on Twitter Thursday.

The deaths occurred when a truck ploughed into a crowd watching a Bastille Day fireworks display in the southern French resort town.