The sides clashed overnight for the first time since the disaster, with government forces shelling the outskirts of Atareb, a rebel-held town badly hit by the earthquake, the Syrian Observatory for Human Rights reported on Friday.
Thousands of Syrians who had sought refuge in Türkiye from their country's civil war have returned to their homes in the war zone - at least for now.
For families still waiting to retrieve relatives in Türkiye, there is growing anger over what they see as corrupt building practices and deeply flawed urban development that resulted in thousands of homes and businesses disintegrating.
One such building was the Ronesans Rezidans (Renaissance Residence), which keeled over in Antakya, killing hundreds.
"It was said to be earthquake-safe, but you can see the result," said Hamza Alpaslan, 47, whose brother had lived in the apartment block.
"It's in horrible condition. There is neither cement nor proper iron in it. It's a real hell."
Türkiye has promised to investigate anyone suspected of responsibility for the collapse of buildings and has ordered the detention of more than 100 suspects, including developers.