BEIRUT – A rocket slammed into a building in Syria's northern city of Aleppo and two suicide bombers struck near a mosque in the south Friday, capping a particularly bloody week in the country's civil war with more than 800 civilians killed, including an unusually large proportion in government-held areas.

The residential building struck in Aleppo was in a part of the city controlled by regime forces, as was a university hit earlier in the week in an attack that killed 87 people, mostly students. The government accused rebels in both attacks, saying they hit the locations with rockets, a claim the opposition denies.

But if confirmed it would signal that the rebels have acquired more sophisticated weaponry from captured regime bases and are now using them to take the fight more into government-held areas in an attempt to break a monthslong stalemate in the war.