BEIRUT (AP) — Weakened Syrian rebels are making their last desperate stand in Homs, as forces loyal to President Bashar Assad launch their harshest assault yet to expel them from the central city, once known as the capital of the revolution.

Some among the hundreds of rebels remaining in the city talk of surrender, according to opposition activists there. Others have lashed back against the siege with suicide car bombings in districts under government control. Some fighters are turning on comrades they suspect want to desert, pushing them into battle.