Ten fighters from Lebanon’s Shi’ite Hezbollah group were killed in clashes with fighters from al Qaeda’s Syrian wing in eastern Lebanon on Sunday, a source close to the group said on Monday.

The death toll was one of the highest the group has suffered in a single action since it said it would fight alongside the forces of Syrian President Bashar al-Assad.

The move by Iran-backed Hezbollah, announced last year, has helped turn the tide of civil war in Syria against insurgents seeking to oust Assad. […]