Clashes erupted on Monday in the outskirts of the northeastern border town of Arsal between the extremist Islamic State and al-Nusra Front groups, state-run National News Agency reported.
The agency said the fighting broke out after the IS shot a man identified as Ahmed Seifeddine in the town before abducting him to its mountainous outskirts.
The abductee goes by the nickname Al-Silis and is a member of al-Nusra Front, NNA added.
The two groups have been clashing in the town's outskirts for months now.