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Update VI: The Russian security service FSB says that they are now looking for three potential accomplices, and that the actions are suspected of originating with terrorists from the North Caucasus, where the Islamist separatists operate:
A criminal case has been opened into the apparent terror attack. Police are searching for three suspects in connection with the blast after watching airport security camera footage.
Three men who have been living in the Russian capital for a certain period of time reportedly took part in organizing the blast, a source told Interfax news agency. He also noted that these three were believed to be Russian North Caucasus militants and might have been somehow connected to two women, one of whom blew herself up at a practice range club in Moscow on December 31 and the other was later arrested in the city of Volgograd.
Reportedly, the FSB knew that an attack was imminent, but didn’t know where or when it would hit.