Saudi-led warplanes carried out new strikes on an arms depot in the rebel-held Yemeni capital on Tuesday, hours before a five-day ceasefire is scheduled to begin, an AFP correspondent reported.
It was the second straight day that the coalition had hit the depot in a military base on Mount Noqum in the eastern outskirts of Sanaa.
Twin strikes on Monday killed at least five people and wounded 20, as huge explosions sent debris crashing into a residential area at the foot of the mountain.
An April 21 coalition raid on a rebel-held missile base in Sanaa set off explosions that killed 38 people and wounded 532.
A five-day pause in the coalition bombing campaign was due to start at 11:00 pm (2000 GMT) to allow deliveries of desperately needed relief supplies.
It would be the first break in the air war in support of exiled President Abedrabbo Mansour Hadi since its launch on March 26 and has strong backing from Washington, which has said it could be extended.
Riyadh has stressed the offer is conditional on the rebels reciprocating and not exploiting the ceasefire for military advantage.
The United Nations has expressed deep concern about the civilian death toll from the bombing campaign and the humanitarian impact of the accompanying air and sea blockade Saudi Arabia and its allies have imposed on its impoverished neighbour.
Aid groups have warned that five days is not enough to get in the supplies that are needed.