What hostage incident began the research and understanding of Stockholm Syndrome?

The term "Stockholm Syndrome" originated from a bank robbery in Stockholm, Sweden, in August 1973, where hostages were held for six days. During this incident, the captives developed sympathetic feelings for their captors, even defending them after being freed. This psychological phenomenon prompted researchers to explore the dynamics of hostage situations and the complex emotional bonds that can form between captives and their abductors. The case highlighted the intricacies of human psychology in extreme circumstances, leading to a broader understanding of trauma and attachment.