The Moscow subway line hit by two separate...
"According to preliminary estimates, the criminal investigators will finish their work within 3-3.5 hours," Biryukov said at a meeting in the National Center for the Management of Crisis Situations of Russia"s Emergencies Ministry.
The first attack took place at 7:52 a.m. (04:52 GMT) at the Lubyanka station of the Sokolniki metro line, located a short distance from the headquarters of the Federal Security Service (FSB), and killed at least 23 people, with another 39 injured.
The second blast detonated some 40 minutes later on the same line at the nearby Park Kultury station, within a walking distance of the Kremlin. At least 12 people lost their lives and at least 23 were injured.
The FSB said two female suicide bombers were responsible for both attacks.
The blasts, described by a police source as "a well-planned terrorist attack," took place in crowded trains as people hurried to work on the first day of the working week.