Fresh fighting flared in Yemen's southern city of Aden today after separatist forces seized government buildings in what the Prime Minister said is an attempted coup. <br/><br/>Aden has served as the headquarters of Saudi-backed President Abedrabbo Mansour Hadi's Government since it was forced out of the capital Sanaa by Shiite rebels three years ago. <br/><br/>The separatists — who want the return of the independent South Yemen that existed before 1990 — supported Hadi's forces against the rebels but tensions between the two sides have risen in recent months. <br/><br/>The flare-up in Aden has added yet another dimension to one of the world's most complicated conflicts, a civil war that left thousands dead and millions on the brink of starvation.<br/><br/>Today sporadic clashes continued after fighting overnight in the port city, especially in its north where separatist forces tried to take control of a military camp, security sources said.<br/><br/>