newsroom continues now. good morning. thank you so much for joining me, i m carol costello, video you will only see on cnn. we want to warn you, the pictures are disturbing. they re from the syrian capital of damascus where a mass grave has been dug. the area reportedly sustained the highest death toll from last week s alleged chemical gas attack. cnn s frederik pleitgen joins mess now. hi, fred. reporter: hi, carol. yeah, obtained by cnn. so a ground furor, if you will of the chemical weapons attack, among them, a mass grave.