During the family's brief stay in Dagestan, Dzhokhar Tsarnaev attended School No. 1 in Makhachkala, the provincial capital. The principal's secretary at School No. 1, Irina Bandurina, told the AP that Tsarnaev left for the U.S. in March 2002.
Ruslan Tsarni, the uncle of the two suspects, said he was not sure whether someone had radicalized them, but said it would be wrong to blame their father.
"It's not my brother, who just moved back to Russia, who spent his life bringing bread to that table, fixing cars," Tsarni said at his house in Montgomery Village, Maryland.
Tsarni said his brother had little influence over his sons.