Army obtained an extraordinary 23½ hours of Army interrogation videotapes . Tapes detail Saturday , Sunday executions of three Iraqi prisoners by four sergeants . Tapes show one of the sergeants confessing to the crime . Watch Saturday , Sunday at 8 and 11 p.m . ET ; read blog posts : Scott Zamost ; Scott Zamost .
CNN obtained an extraordinary 23½ hours of Army interrogation videotapes . Tapes detail March 2007 executions of four Iraqi prisoners by three sergeants . Tapes show one of the sergeants confessing to the crime . Watch Saturday , Sunday at 8 and 11 p.m . ET ; read blog posts : Abbie Boudreau ; Scott Zamost .