The mother of the two men suspected of carrying out the Boston Marathon bombings has claimed that they were set-up.
Zubeidat Tsarnaeva said it was "impossible" for Tamerlan, 26, and Dzhokhar, 19, to carry out the attacks.
Tamerlan was killed during a gunfight with police and Dzhokhar was captured after a manhunt.
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.