US officials are holding talks with relatives of the Tsarnaev brothers, who are suspected of carrying out the Boston bombings, in Dagestan, according to media reports.
BBC News reports that a delegation from the US Embassy in Moscow flew in to the Russian republic last night. News agency AFP reports that the FBI was involved in the interviews.
The eldest of the two brothers, Tamerlan, spent six months in Dagestan and his native Chechnya last year.
Among those terribly injured by the Boston marathon bombs was a dance instructor. Adrianne Haslet-Davis lost her foot in the explosion.
The mother of the two brothers suspected of carrying out the Boston bombings told ITV News they saw last year's race but are innocent.
Boston's marathon bombing suspect Dzohkhar Tsarnaev was charged with an offence that could lead to the death penalty, if he is found guilty.