SANA, Yemen — A suicide bomber linked to Al Qaeda drove a car filled with explosives into a hospital used as a base by Yemen’s Shiite Muslim Houthi movement on Sunday, killing at least 15 people, officials said.

Militant, tribal and local officials said the attack had taken place in the town of Majzar in Marib Province, east of Sana, the capital.

Houthi fighters seized Sana on Sept. 21 after four days of fighting with soldiers loyal to the Sunni Muslim Islah party. They have since refused to leave the capital, despite an agreement they signed with President Abdu Rabbu Mansour Hadi to include some of their members in the government.

The militant group, Ansar al-Shariah, which is the local branch of Al Qaeda in the Arabian Peninsula, claimed responsibility for the attack in a statement on its Twitter account. On Saturday, the group said it had fired a rocket that landed near the United States Embassy in Sana.