MOSCOW, RUSSIA - MARCH 29: Russian opposition politician Boris Nemtsov looks on in memory of the victims of a blast inside the Lubyanka metro station on March 29, 2010 in Moscow, Russia.  At least 38 people were killed and 60 injured as two separate female suicide bombers blew themselves up on trains on Moscow's metro during morning rush hour. Twenty-five people died in the Lubyanka station blast and around 45 minutes later a second explosion occurred at the Park Kultury station leaving another 12 people dead.  (Photo by Dmitry Korotayev/Epsilon/Getty Images)