SANAA — At least 16 members of the extended family of a Yemeni mosque imam were killed on Wednesday in an air strike on their family home in northern Yemen by the Saudi-led coalition, a Reuters witness, a medic and a resident said.

The coalition has been giving air support to President Abd-Rabbu Mansour Hadi in his fight against the Houthis, who have seized much of Yemen since 2014, but has drawn criticism over civilian casualties incurred in the campaign.

Witnesses said missiles struck a house of the imam, identified as Saleh Abu Zainah, in Saada in northern Yemen, the home territory of the Houthis.

The imam, his family, his two sons and their families all died in the attack, including at least four children, they said.

A Saudi military spokesman said the coalition was checking whether the report was true and that an investigation would be conducted and its results published if the incident was verified.

“The air raid happened in the morning and because the house was made of mud, it took us until noon to be able to dig the bodies out,” said Nayef, a resident who helped remove the rubble to recover the bodies.

At least 10,000 people have been killed in the 18-month-old civil war, the United Nations on Tuesday, approaching double the estimates of more than 6,000 cited by officials and aid workers for much of 2016.