It is thought that the brothers who have been identified as suspects in the Boston marathon bombing, Dzhokhar and Tamerlan Tsarnaev, are from a Russian region near Chechnya, having moved to the US around 10 years ago.
ITV News correspondent Lewis Vaughan Jones reports:
Detectives in Boston are looking further afield as they piece together their case against Marathon suspect Dzohkhar Tsarnaev.
The uncle of Boston bombing suspect Tamerlan Tsarnaev described his recent visit to Dagestan in Russia and his great shock at the attacks.
Both men were enrolled in a school in Dagestan, a neighbouring region that was drawn into Chechnya's violence during the 1990s.