Dubai: At least 10 children were killed and 21 injured in northern Yemen on Saturday, aid group Medecins Sans Frontieres said, in what the country's dominant Houthi group said was a Saudi-led air strike on a school.

The tragedy occurred as Yemen's parliament convened for the first time in almost two years, in a move that bolsters the Houthi movement and challenges the Saudi-backed exiled government.

Shiite rebels, known as Houthis, carry the coffin of a fellow Houthi who was killed during fighting against Saudi-backed Yemeni forces in Marib province in May. Credit:AP

A spokesman for the Saudi-led coalition had no comment on the attack. Saudi Arabia and its allies have launched thousands of air strikes against the Houthis since they drove the internationally recognised government into exile in March 2015.

"@MSF received today 21 injured & 10 deaths in Haydan #Saada. All were under 15 years old," the medical aid group said on its official Twitter account.