The Saudi-led coalition resumed its bombing campaign early on Monday with raids on second city Aden, accusing the rebels of violating the temporary ceasefire which expired the previous night.
Today's raids in the capital hit the presidential palace complex and several bases of troops loyal to ousted strongman Ali Abdullah Saleh, who is allied with the Shiite rebels.
Witnesses said the targets included the Republican Guard missile brigade base of Fajj Attan, in south Sanaa, where previous strikes on April 20 set off a chain of explosions that killed 38 civilians.
Residents also reported raids in the central province of Taez, and Daleh and Aden in the south.
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But coalition spokesman General Brigadier Ahmed al-Assiri charged on Monday that the rebels had abused the truce.
"They did not respect the humanitarian pause. That's why we do what is necessary to be done," he told AFP.