Most of the killing was done by an SS unit under the command of Jochen Peiper. Peiper was an ardent Nazi and a real ruthless thorough going bastard who made a name for himself on The Russian Front. He earned the name ''Blowtorch'' for a frightening tactic of the SS which was to lock civilians or prisoners in a barn or a church and setting it on fire. He survived the war and a short prison stint but got his in the end in 1976 when his home was fire bombed. Suspicion had the Bader-Meinhof gang as the culprits but it was never proven. All in all a fitting end for the ''Blowtorch''.
Such was portrayed in the film, "Come and See" (Idi i Smotri)
Pieper chose to live in France after his prison term, an odd choice.