Washington ( CNN ) -- Caucasus Emirate is added to the U.S. list of terrorist organizations . The State Department links the group 's leader to a suicide bombing in Chechnya . The group also claims responsibility for three bombings in Russia .
Caucasus Emirate is added to the U.S. list of terrorist organizations . The State Department links the group 's leader to a suicide bombing in Chechnya . The group also claims responsibility for three bombings in Russia .