The Britain-based Syrian Observatory for Human Rights, an opposition war monitor, said rebels withdrew from Idlib province's Maarat al Numan town late on Tuesday.
Idlib has come under mounting bombardment in recent weeks, displacing tens of thousands of people in the northwestern province, despite a truce brokered by Turkey and Russia.
Residents of villages and towns in southern parts of Idlib province have been fleeing while regime forces have been pushing into the northwestern province of Idlib toward a rebel-held town, Maaret al Numan.
War monitor SOHR says regime push "is an attempt to get closer to Maaret al Numan" in Idlib province which Russia and regime have intensely bombed fuelling exodus of Syrians, many of whom Turkey's President Erdogan says are marching towards Turkey.
Syrian regime and Russian forces have killed at least six civilians in northwestern Idlib province, according to a war monitor.
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