An empty building becomes a war zone in suburban Damascus.
Fierce fighting erupts as rebels take aim at government forces.
The video, which can not be independently verified by Reuters comes as the Syrian government is intensifying efforts to reclaim territory.
Millions have fled their homes. . Those left behind are struggling with hunger, dwindling supplies as growing blockade cuts off food to rebel held areas.
Scenes from a field hospital show efforts to treat the wounded.
More than 100,000 people have died in the conflict which began with peaceful protests more than two years ago.
While the UN envoy to Syria said he still hopes long delayed peace talks can be held in the coming weeks -- so far no date has been set.