A bomb attack on the governor's temporary headquarters in Yemen's main southern city of Aden on Thursday killed four people and wounded 10 others, security officials and medics said.

Governor Nayef al-Bakri was unharmed in the blast at the headquarters of the Aden Faculty of Administrative Sciences, which is housing the governor's offices, the sources said.

It was the first such attack in Aden since pro-government forces retook the city from Iran-backed Shiite rebels in mid-July.