Germany was warned about a possible terror attack against Israeli athletes one month before the Munich Olympics in 1972, Der Spiegel reported.
The weekly magazine reported Sunday on its website that though solid warnings of an attack plan were received a month before the Games, no action was taken.
The Palestinian terrorists, for example, were able to walk by the apartments of the Israeli athletes without being stopped.
Der Spiegel also reported that German police had prepared possible scenarios for a terror attack at the Games, including one that dealt specifically with a Palestinian attack on the Olympic village, but after the attack the police said there were no written documents of the preparations and German authorities tried to cover up their failures.
The story is based on reports of the post-attack inquiry, minutes from German Cabinet meetings and documents from government bodies obtained by Der Spiegel.