What is Stockholm syndrome? It all started with a bank robbery 50 years ago

In this photo released by police, three of the four hostages and bank robber Clark Olofsson, standing right, are seen in a bank in Stockholm, Sweden, Aug. 27, 1973, shortly before the gunmen were overwhelmed by police. This week marks 50 years since a failed bank robbery that gave rise to the Stockholm syndrome, a term used in psychology to describe the bond that victims of kidnappings or hostage situations sometimes develop with their captors. (AP Photo, File)