"Some of the bodies are impossible to identify," Dr Falih Hassan said at the morgue. "But we can tell the victim's religion: if they have been beheaded they are Shia, if they have been killed by an electric drill or hammer blows to the face they are Sunni."
For the fighters roaming Baghdad, the logic is simple. Hassan Alami, 25, a Shiite from Sadr City, said the holes drilled in the Sunni heads were to "destroy their stupid minds". The Sunnis are said to behead their victims because this was how Muhammad dealt with apostates.
The source of these quotes, and more of the appalling article, are here, but the link that's supplied doesn't work.