They say the attack took place overnight and into the morning hours today in the city's southern neighborhood of Fag Attan. The death toll was expected to rise further as rescuers pull more victims from under the rubble.
Earlier this week, coalition fighter jets struck a hotel in Arhab, north of Sanaa, killing at least 41 people. The Saudi-led coalition is waging an air campaign against Yemen's Shiite rebels and forces loyal to a former president.