Powerful explosions shook the Yemeni capital on Monday after warplanes from the Saudi-led coalition struck a rebel arms depot.

The raid targeted the depot in the Mount Noqum area on the eastern outskirts of Sanaa, triggering several blasts, an AFP correspondent and witnesses said.

Thick black smoke billowed from the site and debris was scattered in residential areas at the foot of the hill, witnesses said.

There were no immediate reports of casualties.

The attack came a day ahead of a hoped-for five-day humanitarian truce proposed by the Saudi-led coalition which launched strikes against rebels in late March in support of exiled President Abedrabbo Mansour Hadi.