A powerful explosion levels the central portion of a block-long Moscow apartment building shortly after midnight, killing 94 people. The building is located on Guryanov Street in a working-class suburb, far from the heart of Moscow. Yuri Luzhkov, the mayor of Moscow, who has a degree in chemistry, identifies the probable explosive as hexagen, also called RDX. He says the attack was probably carried out by Chechen terrorists: “Visual signs suggest that it was a terrorist act similar to the one carried out in Buinaksk” (see September 4, 1999). Interfax reports that an anonymous caller declared that the explosion is “our response to air strikes against peaceful villages in Chechnya and Dagestan.” [New York Times, 9/10/1999; Moscow Times, 9/10/1999; BBC, 8/10/2000] Another Moscow apartment building is bombed on September 13, killing over 100 (see September 13, 1999). Later in the month, explosives will be found in an apartment building in the nearby city of Ryazan. The Russian government will initially declare it a foiled bombing until the suspects arrested turn out to be FSB agents. The government will then claim it was merely a training exercise (see September 22-24, 1999). This will lead some to suspect that all three apartment bomb incidents this month were false flag attacks by the FSB (see March 6, 2002, December 30, 2003 and January 2004).