Syrian government forces have aerially bombed Aleppo, killing at least 18 people.
The strike on February 3 again used barrel bombs -- barrels packed with explosives and scraps of metal that are thrown from helicopters.
These crude weapons have been used repeatedly in Aleppo where rebels still hold large areas of the city.
The Britain-based Syrian Observatory for Human Rights said the attack targeted the Aleppo districts of Hanano, Qadi Askar, and Mouwasalat.
Observatory Director Rami Abdel Rahman said residents of the city have been fleeing in the past few days due to the frequency of the barrel-bomb attacks.
Attacks in recent weeks using barrels bombs have reportedly killed scores of people in Aleppo, which is Syria's largest city.
Based on reporting by AP and AFP