Syria's Opposition groups say hundreds killed when government forces fired rockets with chemical warheads into Damascus suburbs, Aljazeera news agency reported Thursday.
Syrian activists claim that government forces have carried out a "poisonous gas" attack in suburbs of the capital, Damascus, leaving hundreds of people dead.
Activists said regime forces fired "rockets with poisonous gas heads" in the alleged attack early on Wednesday.
The Britain-based Syrian Observatory for Human Rights said the shelling was intense and hit the eastern suburbs of Zamalka, Arbeen and Ein Tarma.
It said at least 100 were killed, while the Local Coordination Committees said hundreds of people were killed or injured in the shelling.
The attack coincided with the visit by a 20-member UN chemical weapons team to Syria to investigate three sites where chemical weapons attacks allegedly occurred over the past year.