Syrian opposition activists say the northern city of Aleppo is mostly calm after days of intense shelling and airstrikes that killed dozens.

The carnage has propelled the city — contested since the summer of 2012 when opposition fighters stormed it and took over several neighborhoods — once again as a main battlefield in Syria's devastating civil war.

The Britain-based Syrian Observatory for Human Rights says there has been no major fighting or violence inside Aleppo since early Friday morning. The Observatory says a week of bombardments and air raids killed 123 people in rebel-held parts of the city and 71 and government-held areas.

An activist based in the city says the bombardment slowed down to a halt after midnight. He spoke on condition of anonymity, fearing for his safety.