Yemeni security officials say airstrikes by the Saudi-led coalition targeting Shiite rebels and their allies have struck several cities, including a military base in the capital, Sanaa, despite a declared truce.

They say warplanes also bombed a cement factory in Amran province Sunday, wounding 10 people. Other officials who oppose the rebels, known as Houthis, said they had been storing weapons in the factory.

The security officials say strikes also hit the cities of Saada and Dhamar, while ground fighting also continued in Aden, Taiz, Dhale and Marib despite the truce that began midnight Friday.

Hospital officials say the fighting in Taiz killed six civilians and wounded about 20.

All officials spoke on condition of anonymity because they weren't authorized to brief journalists.