(DAMASCUS) — The Syrian army and rebels unleashed deadly new attacks on each other Friday in Aleppo, with insurgents shelling a mosque during weekly prayers and government airstrikes hitting opposition neighborhoods in escalating bloodshed the U.N. decried as a “monstrous disregard for civilian lives by all parties.” More than 200 people have been killed in eight days of mounting violence in and around the contested northern city, including 15 at the Malla Khan mosque hit by rebel rockets and another 10 from the government warplanes and helicopters, officials said. The surge in fighting has caused the collapse of a two-month cease-fire brokered by the U.S.