I think the following paragraph sums the basic concept up:
"On the evening of September 22, 1999, an alert resident of an apartment building in the town of Ryazan noticed strangers moving heavy sugar sacks into the basement from a car. Militia (the local police) were called to the site and all residents were evacuated. The first test of the powder from the sacks showed the presence of an explosive. All roads from the town were brought under heavy surveillance but no leads were found. A telephone service employee tapped into long-distance phone conversations managed to detect a conversation in which an out-of-town person suggested to take care and to watch for patrols. That person's number was found to belong to an FSB office in Moscow."
Link to the Wikipedia article http://en.wikipedia.org/wiki/Russian_apartment_bombings#Theory_of_FSB_involvement
EDIT: I am not in anyway likening this to 9/11, as some people have suggested.
"On the evening of September 22, 1999, an alert resident of an apartment building in the town of Ryazan noticed strangers moving heavy sugar sacks into the basement from a car. Militia (the local police) were called to the site and all residents were evacuated. The first test of the powder from the sacks showed the presence of an explosive. All roads from the town were brought under heavy surveillance but no leads were found. A telephone service employee tapped into long-distance phone conversations managed to detect a conversation in which an out-of-town person suggested to take care and to watch for patrols. That person's number was found to belong to an FSB office in Moscow."
Link to the Wikipedia article http://en.wikipedia.org/wiki/Russian_apartment_bombings#Theory_of_FSB_involvement
EDIT: I am not in anyway likening this to 9/11, as some people have suggested.
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