Clashes renewed between ISIS [Daesh] and Nusra Front militants Friday along the Lebanese-Syrian border, a security source told The Daily Star, leaving at least three militants dead.
Intermittent, but fierce fighting between the rival extremists has been ongoing since Wednesday when Nusra militants launched a surprise attack on ISIS posts in the Qalamoun region, east of Lebanon's northeastern border town Arsal.
Arsal's Sheikh Mustafa Hujeiri, who is close to Nusra, has been trying to mediate a truce to end the fighting but has so far failed, the source added.
The source said Friday's clashes, which took place on several locations in the Qalamoun, left at least three Nusra militants dead.
They come one day after nine other militants from both sides were killed in fighting in the area, according to the War Media Center, which is affiliated with Hezbollah and has access to events in the Qalamoun and other areas of Syria where Hezbollah is present.
Hezbollah and the Syrian army hold several strategic hilltop posts in the Qalamoun captured during an offensive last year which oversee militant-held areas.
On Wednesday, a security source told The Daily Star that 13 fighters from ISIS and Nusra were killed in the day's fighting. Nusra had also captured four ISIS fighters.
The War Media Center said late-Thursday that the two sides had agreed to end the fighting, and that Nusra would hand over one of three crossings it controls east of Arsal, and to release a number of ISIS militants captured during the clashes.
Friday's resurgence of clashes suggests the deal may have failed to materialize.