Explosion outside Aden government building in Yemen kills four - witnesses

ADEN (Reuters) - An explosive device detonated next to the governor's office in the southern Yemeni city of Aden on Thursday, a local official and witnesses said, killing four people and wounding 11, several of them critically.

The blast underscores instability in Yemen's second largest city a month after fighters loyal to the country's government in exile, backed by arms and hundreds of air strikes from rich Gulf Arab states, seized it from Iran-allied Houthi forces.