Syrian government air raids using barrel bombs on rebel-controlled areas of Syria's second city of Aleppo have killed at least 125 people and injured scores of others, Al Jazeera's reporter in the northern city reported.

Residents on Monday were still trying to recover bodies from the rubble, a day after regime helicopters dropped barrels filled with explosives on civilian rebel-held districts in the northern city.

Al Jazeera's Nicole Johnstone reports.