Jan-Erik Olsson was a Swedish convict who, on August 23, 1973, attempted to rob the Kreditbanken in Stockholm's Norrmalmstorg Square. During the robbery, he took four bank employees hostage and demanded the release of his former cellmate, Clark Olofsson, who was serving a prison sentence at the time. The Swedish authorities agreed to his demand, and Olofsson was brought to the bank to assist in negotiations. The hostage situation lasted for six days, during which the hostages developed an unexpected bond with their captors, a phenomenon that was later termed Stockholm syndrome.