An air strike on a Scud missile base in the Yemeni capital Sanaa caused a big explosion that killing seven civilians, blew out windows in homes, and wounding dozens, medical sources told Reuters.

Yemen's state news agency Saba, run by the Houthi movement which controls the capital, said the bombing resulted in "dozens of martyrs and hundreds of wounded," citing a government official.

Saudi Arabia has led an alliance of Sunni Arab countries in air strikes against the Iran-allied Shi'ite Houthi group and army units loyal to ex-president Ali Abdullah Saleh.

The blast hit the base on Faj Attan mountain beside Hadda district, home to the presidential palace and many embassies, and sent a thick pillar of smoke into the air.

An eyewitness at a hospital in the area said the emergency room was overwhelmed with victims, who screamed in pain from wounds sustained by the flying debris of their homes.

The campaign has repeatedly targeted the Faj Attan facility along with other military bases and airports in Sanaa and throughout the country.

The explosion also damaged the headquarters of a television station, Yemen Today, which is owned by ex-president Saleh, knocking its signal off air and wounding several people, employees told Reuters.