Deadliest attack on American troops in Syria in years comes as Pentagon aims to reduce its footprint while building trust with Damascus-aligned forces to take on ISIS together.

Four senior ISIS leaders were killed in last month's U.S.-Iraqi military raid in western Iraq including the group's top operations leader in Iraq and its chief bombmaker for whom the United States had offered a $5 million reward, the U.S. military said Friday.

The deputy leader of Isis who has been standing in for the terror group's injured caliph, Abu Alaa al-Afri, has been killed in a US-led coalition air strike in ...