U.S. President Donald Trump has discussed efforts to de-escalate tensions in the Middle East in a telephone call with Qatar's emir as the region remained on edge over the possibility of renewed U.S. military action against Iran.

Meanwhile, deadly Saudi airstrikes at a popular market in Yemen killed at least 20 people Friday, the Houthi-run health ministry said.

Authorities in the government-controlled city blamed the Houthis and said there were no airstrikes.