At least 320 people have been killed in Dariya, a suburb of Damascus, an opposition group says. The opposition and government blame each other for the deaths.BEIRUT — Bloodied bodies lay strewn in the streets, in basements and even in the cemetery in the besieged Damascus suburb of Dariya, site of what may be the largest mass killing to date in more than 17 months of fighting in Syria, according to opposition and pro-government accounts Sunday.