BEIRUT - At least 25 people were killed in barrel bomb attacks in Syria's northern city of Aleppo on Monday, a monitoring group said.

Barrel bomb attacks are strikes in which helicopters drop highly destructive improvised explosives. Western powers have condemned their use as a war crime, but they continue to be used almost every day in Aleppo and other parts of Syria.

The Britain-based Syrian Observatory for Human Rights said Monday afternoon's strikes occurred in the al-Sukkari neighborhood of Aleppo, Syria's largest city, now divided between government and rebel forces.

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