SANAA, Yemen — Airstrikes carried out by a Saudi-led coalition against Yemen’s Shiite rebels and their allies have killed 29 people, including civilians, in the capital Sanaa, security and medical officials in the city said Saturday.

The coalition’s airstrikes overnight hit an apartment building in the center of the capital, an area that is a UNESCO world heritage site, killing a family of nine, said the officials, who remain neutral in the conflict that has divided Yemen’s security forces.

Another civilian was also killed and rescuers were searching for other possible victims buried under the rubble. The rebels, known as Houthis, lost 19 fighters in the overnight attack the officials said.

Yemen has been torn by a ferocious war pitting the Houthis and forces fighting for former President Ali Abdullah Saleh against fighters loyal to exiled President Abed Rabbo Mansour Hadi, as well as southern separatists, local militias and Sunni extremists.