http://people.howstuffworks.com/stockholm-syndrome.htm
In 1973, two men entered the Kreditbanken bank in Stockholm, Sweden, intending to rob it. When police entered the bank, the robbers shot them, and a hostage situation ensued. For six days, the robbers held four people at gunpoint, locked in a bank vault, sometimes strapped with explosives and other times forced to put nooses around their own necks. When the police tried to rescue the hostages, the hostages fought them off, defending their captors and blaming the police. One of the freed hostages set up a fund to cover the hostage-takers' legal defense fees. Thus "Stockholm syndrome" was born, and psychologists everywhere had a name for this classic captor-prisoner phenomenon.
http://people.howstuffworks.com/stockholm-syndrome.htm