The Saudi-led coalition has announced the end of the Yemen ceasefire.
The truce, which began on December 15, followed intense bombing of the Houthi movement by the Arab allies.
The Reuters news agency claims nearly 6,000 people have been killed since the Saudi coalition entered the conflict in March, almost half of them civilians.
The main fight is between forces loyal to the President and Shia rebels known as Houthis.
United Nations peace talks have failed to find a solution so far - but they will resume later this month.