No group has to date claimed responsibility for the attacks , but suspicion has fallen on Chechen separatist groups . IOC president Thomas Bach condemns 'despicable ' attacks on Volgograd . Has written to Russian president Vladimir Putin to send condolences . Over 30 people killed in two attacks on public transport system . Score: 6
IOC president Thomas Bach condemns 'despicable ' attacks on Volgograd . Has written to Russian president Vladimir Putin to send condolences . Over 30 people killed in two attacks on public transport system . Score: 6