Turkish tanks and armored vehicles took up positions around Kafr Jana, a rugged area that the main jihadist rebel group Hayat Tahrir Al-Sham seized on Monday from two rival factions belonging to a coalition of rebel forces backed by Ankara.

Turkish army and security officers worked to bring the warring factions back to the negotiating table to implement a peace deal reached last Saturday that led to a one-day respite from five days of clashes that left scores dead on both sides.

“Turkey has now intervened to stop the conflict and prevent Hayat Tahrir Al-Sham from progressing and to get both sides to the negotiating table to implement the accord,” Waiel Olwan, a former opposition official in touch with both sides, said.

Tensions have been building in the opposition-held northwest under rebel control, mainly over ideological differences between Islamist militant and more nationalist-leaning armed factions.

Monday’s renewed fighting was triggered by mutual charges that both sides had reneged on the Turkey-brokered deal that saw jihadist fighters withdraw from the city of Afrin, which they seized from mainstream rebels. Those rebels also agreed to go back to their barracks away from the populated cities.

Turkey fears HTS’s hold over much of the insurgent enclave would give Moscow a free hand to renew the bombing of a region that is home to more than 3 million displaced Syrians who fled Assad’s rule under the pretext of fighting hard-line jihadists.

Russian fighters have in the last few days escalated strikes in the area in a message by Moscow that it will strike with impunity areas that now fall under the wider influence of the jihadist group, three rebel commanders said.

Washington, which has been leading a coalition campaign that has killed in recent years hard-line jihadists affiliated with Al-Qaeda in northern Syria, demanded a return to the status quo.

“We are alarmed by the recent incursion of HTS, a designated terrorist organization, into northern Aleppo. HTS forces should be withdrawn from the area immediately,” the US Embassy in Damascus said.

Turkey’s large military presence, with thousands of troops stationed in a string of bases in northwest Syria, had held back Russian-backed Syrian forces from seizing the rebel-held area.

Rebels said the jihadist group, which has expanded its influence since fighting broke out in Afrin region, was now positioned several kilometers away from the border city of Azaz, the administrative center of the mainstream Turkish-backed opposition government.

A senior official in the coalition fighting HTS said they had reinforced positions around the city to repel any attempt by the jihadists to take it over.

Azaz has seen in the last two days street protests opposed to the entry of the jihadists.

Many inhabitants fear a takeover by the jihadists who run an efficient civilian administration in the Idlib region, their main stronghold, but rule with an iron fist.