A temporary camp that had been housing thousands of mostly Haitian migrants has been completely cleared, US authorities said on Friday.

"As of this morning, there are no longer any migrants at the camp underneath the Del Rio bridge," Homeland Security Secretary Alejandro Mayorkas told members of the media at the White House.

Around 15,000 people had descended on the small Texan town of Del Rio, hoping to get asylum in the US.

Del Rio's Mayor Bruno Lozano said it was "phenomenal news."