at this stage, we believe bbcmikeembley let -- gideon macomb we appears to be claiming responsibility for these attacks could he's a former presidential candidate who ran unsuccessfully against president kabila in 2006 pt has been critical of the government and outspoken critic of the peace deal signed between kinshasa and the defeated rebels. we will be bringing you details on this rapidly developing story as quickly as possible. a few hours ago, a bomb exploded on a trolley bus in russia, possibly a suicide bomber according to authorities. the current death toll stands at 14 people killed. the bus was packed with early- morning commuters. becomes less than 24 hours after an explosion at the main train station that killed multiple people. jessica is in moscow. what do we know about the current state of the investigation? >> we just heard from the head of the russian investigative committee that the attacks most likely are connected. officials are saying this because it appears the same sort of materials were used in yesterday's bomb and also in today's in an attempt to produce the mo