AL MUKALLA, Yemen — The death toll in a drone and missile attack on a government military training base in central Yemen rose to at least 76 on Sunday, representing an escalation bound to complicate international efforts to end the country’s prolonged war.

The attack targeted soldiers gathered Saturday near a mosque in the central province of Mareb before evening prayers. Abdu Abdullah Majali, a spokesman for the Yemeni Army, which is backed by Saudi Arabia, provided the new death toll and said at least 81 people were wounded.

But Yemen’s foreign minister, Mohammed al-Hadrami, gave a higher toll, saying more than 100 people were killed. He called it a “cowardly terrorist act that violates all religious and human customs and values” in a statement on his ministry’s Twitter feed.

Yemen’s Houthi rebels, who are aligned with Saudi Arabia’s regional rival Iran, did not claim responsibility for the attack. But there are no other forces in the area with a motive to carry it out.