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A series of barrel bombs dropped by Syria's government has killed at least 75 people and wounded dozens others in Aleppo province, medical sources and a monitoring group said, according to Al Jazeera.

The deaths occurred in two separate incidents on Saturday when helicopters dropped explosives-filled barrels, which are deemed illegal under international law.

One barrel bomb hit the rebel-held Shaar neighbourhood of the city of Aleppo, killing at least 20 people, most of them from the same family, local activists have told Al Jazeera.

In the second attack, at least 55 people were killed after bombs hit a busy market in al-Bab city - about 40km northeast of Aleppo city, which is controlled by the Islamic State of Iraq and the Levant (ISIL).

The Syrian Observatory for Human Rights, which documents violence through a network of activists on the ground, dubbed the al-Bab attack as a "massacre", adding that the number of dead likely would rise because many of the wounded were in critical condition.