FILE - In this early Thursday, Sept. 9, 1999 file photo smoke rises from an apartment building destroyed by a bomb blast blamed on Chechen militants, as Russian Emergency Situations Ministry officers and firefighters try to save people in Moscow. Two suspects in the Boston Marathon bombing have been identified to The Associated Press as coming from a Russian region near Chechnya In the past, insurgents from Chechnya and neighboring restive provinces in the Caucasus have been involved in terror attacks in Moscow and other places in Russia. (AP Photo/Ivan Sekretarev, file)

Associated Press
FILE - In this early Thursday, Sept. 9, 1999 file photo smoke rises from an apartment building destroyed by a bomb blast blamed on Chechen militants, as Russian Emergency Situations Ministry officers and firefighters try to save people in Moscow.  Two suspects in the Boston Marathon bombing have been identified to The Associated Press as coming from a Russian region near Chechnya In the past, insurgents from Chechnya and neighboring restive provinces in the Caucasus have been involved in terror attacks in Moscow and other places in Russia. (AP Photo/Ivan Sekretarev, file)
FILE - In this early Thursday, Sept. 9, 1999 file photo smoke rises from an apartment building destroyed by a bomb blast blamed on Chechen militants, as Russian Emergency Situations Ministry officers and firefighters try to save people in Moscow. Two suspects in the Boston Marathon bombing have been identified to The Associated Press as coming from a Russian region near Chechnya In the past, insurgents from Chechnya and neighboring restive provinces in the Caucasus have been involved in terror attacks in Moscow and other places in Russia. (AP Photo/Ivan Sekretarev, file)
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