The Norrmalmstorg robbery occurred in Stockholm, Sweden, in August 1973. A group of armed robbers took hostages in a bank during a six-day standoff with police. The incident gained significant media attention and led to the development of the term "Stockholm syndrome," which describes the bond that can form between hostages and their captors. During the robbery, the hostages were held in a vault and were treated relatively well by the robbers. The situation escalated when police attempted to negotiate, but the robbers refused to release the hostages until their demands were met. The event ended with the safe release of the hostages and the arrest of the robbers.