An air strike hits a military site controlled by the Houthi group in Yemen's capital Sanaa May 12, 2015. [Photo/Agencies]

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In the latest violence, warplanes bombed targets in the northern province of Hajja near the border with Saudi Arabia, killing 20 people, most of them civilians, residents said.

Looking to prepare for the truce and jumpstart stalled political talks among Yemen's civil war factions, the new UN envoy to the country arrived in Sanaa, saying fighting would not resolve a conflict that crosses ethnic and religious faultlines.

"We are convinced there is no solution to Yemen's problem except through a dialogue, which must be Yemeni," the envoy, Mauritanian diplomat Ismail Ould Cheikh Ahmed, was quoted as saying by the local Saba news agency.

Seeking to restore exiled President Abd-Rabbu Mansour Hadi, an alliance of Gulf Arab nations has since March 26 been bombing the Iranian-backed Houthi militia and allied army units that control much of Yemen.

Saudi-led air strikes on a rocket base in Sanaa on Monday killed 90 people and wounded 300, a local official was quoted as telling Saba. If confirmed, the death toll would be among the highest in a single bombing incident throughout Yemen's war.