Police have detained suspects accused of...
"We made arrests. Very serious work is underway," the source told RIA Novosti.
The two bombs detonated on March 29 during the morning rush hour at the Lubyanka and Park Kultury metro stations, killing 40 people and injuring over 100.
Police identified the suicide bombers as Dzhanet Abdurakhmanova (Abdulayeva), 17, and Maryam Sharipova, 28, both residents of Russia"s North Caucasus republic of Dagestan.
Abdurakhmanova was the widow of Dagestani militant Umalat Magomedov (Al-Bar), who was killed during a special law enforcement operation on December 31, 2009, after he shot at police who were attempting to search a car he was traveling in.
Sharipova was a school teacher and wife of militant leader, Magomedali Vagapov.
Moscow police later found an apartment which was rented by the suspected male accomplices of the bombers, who are believed to have accompanied the two women to the metro and given them explosive belts.