Syrian government helicopters dropped a barrel bomb Tuesday in a neighborhood in the northern city of Aleppo, hitting a busy bus depot and killing at least 28 people, activists said. The attack on the Jisr al-Haj neighborhood killed at least 28 people and wounded nearly 30, the Britain-based Syrian Observatory for Human Rights said. It said the count may rise because many wounded are in critical condition. The Local Coordination Committees, another monitoring group, said some 50 people were believed killed in the attack. It provided the names of only 13, saying the bodies were hard to identify.