Firefighters respond to the burning Crocus City Hall on March 22.
Mandatory Credit: Maxim Shemetov/Reuters via CNN Newsource
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Moscow concert hall attack suspects appear in court as Russia defends security services
The four men suspected of carrying out a brutal attack at a Moscow concert hall that killed at least 139 people have appeared in court on terror charges, as the Kremlin defended its security services criticized for failing to prevent the massacre.
