The father of Dzhokhar and Tamerlan Tsarnaev has denied his sons were involved in the Boston bombing.
Anzar Tsarnaev spoke to CNN's Nick Paton Walsh briefly from his car, in Makhachkala, Dagestan.
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.