NEW : The family will not bring Tamerlan 's body back to U.S. , spokeswoman said . Authorities have said they believe the brothers acted alone , but are investigating whether they could have learned from or been aided by terror groups , including groups overseas . Source : Tamerlan Tsarnaev says plans changed July 4 before bombing . Body of Tamerlan has been claimed by family . Brothers considered a suicide attack on July 4 , source tells Dzhokhar Tsarnaev .
NEW : The family will not bring Tamerlan 's body back to U.S. , spokeswoman said . Source : Tamerlan Tsarnaev says plans changed July 4 before bombing . Body of Tamerlan has been claimed by family . Brothers considered a suicide attack on July 4 , source tells Dzhokhar Tsarnaev .