NEW : A congressman says suspects `` likely '' planned Boston attacks , then changed plans . NEW : Russia voiced concerns to the U.S. about one suspect , his mother , sources say . Score: 6 Suspect told investigators he and his brother decided `` spontaneously '' to bomb NYC . Dzhokhar Tsarnaev , 19 , was `` more lucid '' the second time he was interviewed , police say .
NEW : A congressman says suspects `` likely '' planned Boston attacks , then changed plans . NEW : Russia voiced concerns to the U.S. about one suspect , his mother , sources say . Police : Suspect told investigators he and his brother decided `` spontaneously '' to bomb NYC . Dzhokhar Tsarnaev , 19 , was `` more lucid '' the second time he was interviewed , police say .