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.
Shocked friends of 19-year-old Boston terror suspect Dzhokhar Tsarnaev have described the student as "friendly", "chilled out" and "well adjusted", the Boston Globe reported.
Ashraful Rahman, who studied with Dzhokhar at the Cambridge Rindge & Latin School, reportedly described the alleged bomber as “just a normal guy, very chillaxed and very laid back.”
Another former classmate, Lulu Emmons, was quoted as saying: “He was normal. He kind of fit in with everyone. Not really close with anyone, but he was friendly. I sat next to this guy. I joked with him."
The teenager's wrestling coach Peter Payack told the paper: “Everybody loved him. He wasn’t a loner, the complete opposite. He seemed like one of the most well-adjusted kids on the team."
Dzhokhar's former teacher Larry Aaronson reportedly said: “If someone were to ask me what the kid was like, I would say he had a heart of gold. He was as gracious as possible."
Dzhokhar is currently the subject of a police manhunt in the city after his brother Tamerlan was killed.
The president of Chechnya, Alvi Karimov, said the two Boston terror suspects have "no relations" with the republic and suggested the brothers may have "turned bad" while living outside the region:
– President Alvi Karimov
The people who are suspected of committing crimes in Boston have no relations with Chechnya. The Tsarnaev family moved away from Chechnya many years ago to another region of the Russian Federation, then to Kazakhstan.
So they were not living in Chechnya as adults, and if they turned 'bad', those who brought them up should be held responsible.
The suspects' uncle, speaking to reporters in Montgomery, Maryland, said he was "ashamed" of Dzhokhar and Tamerlan Tsarnaev.
"Of course we're ashamed, they are children of my brother, who had little influence on them," he said.
"They've never been in Chechnya. Chechens are peaceful people."
"I say Dzhokhar, if you are alive, turn yourself in and ask for forgiveness."
"He put shame on the entire Chechen ethnicity."