CNN 's Max Tkachenko contributed to this report . Russian security officials : 3 members of group behind subway bombs killed . Score: 6 Blasts ripped through Lubyanka and Park Kultury stations in Moscow , killing 40 .
Russian security officials : 3 members of group behind subway bombs killed . Score: 6 Blasts ripped through Lubyanka and Park Kultury stations in Moscow , killing 40 .