Saudi Arabia says it is consulting coalition partners about a possible truce in Yemen to allow humanitarian aid to get through.

But on Monday its jets pounded several airports including the capital, Sanaa, as its campaign against Houthi rebels continued.

A cargo plane left in flames on the runway had been due to carry food to remote areas, according to an airport worker.

The Saudi-led coalition of Sunni Arab states has been attacking Iran-backed Houthis and their allies since the rebels took control of large parts of Yemen in March.

At Aden in the south, militias loyal to the exiled President Abd-Rabbu Mansour Hadi have been fighting Houthis for control of the airport.

A militia spokesman said foreign special forces had joined his fighters against the rebels, only to retract his statement after the Saudis denied that they had put non-Yemeni forces on the ground.

Gulf leaders from the Sunni-dominated Gulf Cooperation Council are meeting on Tuesday for an extraordinary summ