SANA, Yemen — Airstrikes by the Saudi-led coalition fighting Houthi rebels in Yemen hit a university used as a detention center in a southwestern province on Sunday, killing at least 60 people, officials and the rebels’ health ministry said.

A spokesman for the International Committee of the Red Cross said the death toll could be more than 100.

The attack was the deadliest so far this year by the coalition, which has faced international criticism for airstrikes that have killed civilians and hit nonmilitary targets.

Yemen officials said the airstrikes had targeted the university in Dhamar that is one of dozens of detention centers run by the Houthis in areas under their control. Dhamar is around 60 miles south of the capital, Sana.