hazards and catastrophes

Hello! What prompted West Germany to release the three surviving perpetrators of the Munich Massacre on October 29, 1972?

The massacre occurred during the 1972 Summer Olympics in Munich when eight members of the Palestinian terrorist group Black September took eleven members of the Israeli Olympic team hostage. Following a failed rescue attempt, all eleven hostages and five of the terrorists were killed. The three surviving attackers were captured and imprisoned by West German authorities.

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