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Russian officials rounded up dozens of suspects Tuesday after two deadly bombings in Volgograd killed 34 just weeks ahead of the Winter Olympics. Nobody has claimed responsibility for the attacks, although there have been threats by Islamist extremists to stop Russia from hosting the Olympic games. Volgograd, located about 400 miles away from Sochi, is a major transit hub for southern Russia, including Chechnya and the mostly Muslim provinces in the North Caucus. In Dagestan, a key city for Muslim extremists, a prosecutor’s assistant was killed by a car bomb Tuesday and two people were killed in separate bomb blast Monday. Meanwhile, Scott Blackmun, the CEO of the U.S. Olympic Committee, said they are “concerned” about the violence so close to the Games and “we got a preview of what could happen.”