Hayat Tahrir al-Sham on Thursday has killed four pro-regime fighters in northern Idlib province, the rebel stronghold where Russia and Turkey have agreed to set up a buffer zone, an activist group said.
The northwestern province is the last major area still outside regime control, after a string of ferocious assaults this year put most of the country back in government hands.
Regime ally Russia and rebel backer Turkey agreed to establish the buffer zone in September.
It was due to come into force in mid-October but some clauses of the plan have been delayed, as repeated clashes erupted between militants, rebels and government forces.
At dawn on Thursday, militants from Hayat Tahrir al-Sham, a faction led by former Al-Qaeda fighters, attacked a government position in the east of the province, the Britain based Syrian Observatory for Human Rights said.
"Four regime fighters were killed in the assault, and a member of HTS also died," Observatory director Rami Abdel-Rahman said.
"There is an ongoing exchange of artillery fire between the two parties" in land that is part of the planned demilitarized zone, he added.
The agreement between Russia and Turkey to create the buffer zone was aimed at staving off a government military assault on the province.
As set out under the deal, rebel groups announced they had withdrawn heavy artillery from the zone, but militants including HTS refused to leave the area.
Artillery fire by regime forces killed at least seven civilians in Idlib Friday last week, the Observatory said.
Syria's Foreign Minister Walid al-Moallem expressed dissatisfaction this week with the implementation of the agreement, and criticized Turkey for shortcomings.
"Terrorists are still present in this sector with their heavy weapons," he was quoted as saying by the official SANA news agency Monday, referring to the buffer zone.
"This indicates that Turkey does not want to respect its obligations," he added.
Syria's war has killed more than 360,000 people since it erupted in 2011 with the brutal repression of anti-regime protests.
AFP
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