Bomb suspect Instagram account was deleted recently – unlike Dzhokhar Tsarnaev's other social media accounts. The bomb suspect also 'liked' an Instagram photo linked to Chechen terrorism.
Russia eliminated a number of top militant leaders. Russian experts warn that eliminating Osama bin Laden does not remove the threat of Al Qaeda attacks.
Chechen warlord Doku Umarov claimed responsibility for the Moscow metro bombings that killed 39 people earlier this week and threatened more attacks. Is Umarov leading a Chechen version of Hamas?
Russia alleges two Chechen women carried out Moscow subway bombing that killed at least 38 people. If that allegation proves true, it will mark the return of the black widow suicide bombers.
Colleagues of Ms. Estemirova say her murder Wednesday is part of a pattern that shows cost of a Kremlin pact with Chechnyan President Ramzan Kadyrov.