BEIRUT, April 14 (Reuters) Syrian forces loyal to President Bashar al-Assad shelled the battered city of Homs on Saturday, opposition activists said, the first bombings since a ceasefire began on two days ago.

ISTANBUL, Apr 14 (Reuters) Iran and world powers have a rare chance on Saturday to halt a downward diplomatic spiral over Tehran's nuclear program and ease fears of a new Middle East war when they resume stalled talks, but diplomats warn against expecting quick results.