48 HOURS has obtained never-before-seen videotape shot by the terrorists who took 1,200 people hostage on Sept. 1, 2004 for three days at a school in Beslan, Russia. Roughly half of the hostages are believed to have been children. Correspondent Peter Van Sant speaks to the hostage negotiator, Ruslan Aushev, who is seen in the new video negotiating with the terrorists' leader. The footage also captures the dramatic moment when the terrorists let mothers leave captivity with their babies, some of whom were forced to leave their older children behind.