At least 22 people, including 14 children, were killed in regime air raids on rebel districts of the northern city of Aleppo on Sunday, the Syrian Observatory for Human Rights said. "An (aerial) attack using explosive-laden barrels over the Sakhur, Ard al-Hamra and Haydariyeh districts (of eastern Aleppo) killed 22 people, among them 14 children and an 18-year-old boy," said the Britain-based Observatory.