Thursday marked the second anniversary of the 2010 twin metro bombings that killed 40 and injured some 160 people, and Muscovites took time to mourn the victims.
Two years ago, two female suicide bombers blew themselves up at the Lubyanka and Park Kultury metro stations during the morning rush hour.
On Thursday, dozens of people carried flowers and candles to the two metro stations in memory of those killed by the blasts.
The bombers were identified as Dzhanet Abdurakhmanova, a 17-year-old widow of a senior militant from the North Caucasus, and Mariam Sharipova, 28, a schoolteacher from the turbulent republic of Dagestan.
At that time, rebel leader Doku Umarov claimed responsibility for the attacks in an online video.
But a spokesman for the Investigative Committee said the inquiry has not found any evidence of Umarov's involvement, Kommersant reported Thursday.
Instead, investigators claim that the blasts were organized by another Umarov-connected rebel leader, Magomedali Vagabov. He was Sharipova's husband, and he was killed during a special operation later in 2010.
The investigation is still pending, however.
Investigators had previously looked into the possibility that Sharipova's relatives were involved in the attacks.
As a result, her brother Anvar Magomedov fled to Italy, and her father, Rasul Magomedov, went missing in Dagestan.
On Thursday, Moscow police were out in greater numbers on metro trains. In the days preceding the anniversary, two bomb threats were reported to police.
The first threat was made Tuesday by a drunk man at Medvedkovo metro station. The second warning came from an anonymous caller. Neither of the threats has been verified.