Nearly 100 people were killed on Monday in airstrikes across Yemen, the Houthi-run state news agency reported, as a Saudi-led coalition stepped up attacks that are likely to weigh on efforts to broker a humanitarian truce.

The United Nations has been pushing for a halt to the airstrikes and fighting that have killed nearly 3,000 people in Yemen since March when the Saudi-led coalition intervened against the Iranian-backed Houthi forces to try to restore exiled President Abed Rabbo Mansour Hadi.

The Houthi-run Saba news agency said 54 people had been killed in a series of raids in the Amran province, north of the capital Sanaa, including 40 who had been shopping at a market in an area called Lower Joub in the Eyal Yazeed district.