I am going to try and answer you in pieces. This is just an interesting footnote.
Evidence of the explosive hexogen was found on both jetliners.
Hexogen was identified as the explosive in a series of 1999 apartment-building bombings that killed some 300 people in Moscow and other cities and that were blamed on Chechen separatists. The bombings led in part to Putin's decision to send troops back into the region. http://www.news.com.au/common/story_page/0,4057,10604093%255E1702,00.html
Putin has been accused of the hexogen apartment building explosions.
After several explosions in Moscow and the other Russian cities, anti-Chechen feelings began to formulate because the explosions were believed to be caused by members of Chechen gangs. (Moscow news sources reprinted in the Economist in October 1999, revealed that undercover Russian security agents had been caught red-handed planting explosives in an apartment building. The explosions provided Russians a pre-text to invade Chechnya.) Putin used hard tactics to deal with the Chechen rebels to win Russian affections. - History of the Chechen War by Ferdous Shabaz Adel #msg-1150799