An airstrike by the Saudi-led coalition on a primary school in rebel-held northern Yemeninfo-icon Tuesday killed five people including two children, medical and military sources said.

The headmaster and two other staff members were among those killed in the air raid in the district of Nihm, northeast of the capital Sanaa, which also left 13 wounded, the sources said.

A medical source at Kuwaitinfo-icon Hospital in Sanaa confirmed the casualty toll.

A government military official said the school was hit by two missiles by mistake, accusing the Shiite Huthi rebels of keeping armoured vehicles nearby.

Rights groups have repeatedly criticised the coalition over the civilian casualties inflicted by its air strikes on rebel-held regions.

In August, an air strike on a Koranic school in the northern Saada province killed 10 children and wounded 28 others, prompting a U.N. call for a swift investigation.

The Arab coalition launched a military campaign against the Iraninfo-icon-backed rebels in March 2015 in support of President Abed-Rabbou Mansour Hadi.

More than 7,000 people have been killed in the conflictinfo-icon.