Flowers in memory of victims of Tuesday's accident, in which three carriages derailed on a train during morning rush hour, are left next to a sign informing passengers that the station is closed due ... more 
Flowers in memory of victims of Tuesday's accident, in which three carriages derailed on a train during morning rush hour, are left next to a sign informing passengers that the station is closed due to technical reasons, at the entrance to a metro station in Moscow July 16, 2014. Russian state investigators said on Wednesday they had detained two Moscow metro workers suspected of safety breaches that may have caused an accident that killed at least 21 people. REUTERS/Sergei Karpukhin (RUSSIA - Tags: TRANSPORT DISASTER) less 
1 / 30
Reuters | Photo By SERGEI KARPUKHIN / REUTERS
Wed, Jul 16, 2014 9:08 AM EDT