A Saudi-led air strike killed at least six allied Yemeni soldiers on Monday in friendly fire attacks on their base 50 kilometres (30 miles) east of Sanaa, a military source said.

Saudi-led air strikes killed 14 civilians in a village market near Yemen's battleground third city Taez as a nearly three-year bombing campaign intensified, an official and medics said on Wednesday.

A Saudi-led air strike has killed at least three civilians in Yemen's Marib province, a local official said on Sunday, but a rebel news agency gave a higher death toll.

An air raid by the Saudi-led military coalition fighting against the Houthi movement in Yemen shut down the airport in the capital Sanaa on Tuesday, further isolating the country where millions are on the brink of famine, the state news agency SABA reported.

At least 26 fighters were killed in clashes on Monday between pro-government troops and rebels over control of an oil-rich region east of the Yemeni capital, military sources said.

At least 10 children were killed and 21 were 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.

A Saudi-led coalition air strike killed nine civilians outside the Yemeni capital Sanaa on Sunday night, residents said, as forces loyal to the exiled government stepped up an offensive in the area.