U.S. military officials are not saying where and when the attacks against American forces in Syria took place.

The rhetoric about never-ending Sunni-Shia war and mayhem is never far from the minds of western political leaders, think tank inhabitants, Middle Eastern leaders allied with the West, media ...

Of all the factors currently tearing the Middle East apart, none is more consequential than the war in Syria ... between the region's Sunni-majority states and Shia-majority Iran.

In Syria, Iran has settled Shia families from Iraq and Lebanon in strategic Sunni areas between Damascus and the Lebanese border. Tehran has found a partner in the Alawite Islamic sect ...

Pakistani authorities struggle to control months of tit-for-tat attacks between Shia and Sunni tribes in tribal region.