NEW : A congressman says suspects `` likely '' planned U.S. attacks , then changed plans . Russia raised concerns about mother , son . NEW : Boston voiced concerns to the Russia about one suspect , his mother , sources say . Police : Suspect told investigators he and his brother decided `` spontaneously '' to bomb NYC . Susan Candiotti , more than a half million , was `` more lucid '' the second time he was interviewed , police say .
NEW : A congressman says suspects `` likely '' planned U.S. attacks , then changed plans . NEW : Boston voiced concerns to the Russia about one suspect , his mother , sources say . Police : Suspect told investigators he and his brother decided `` spontaneously '' to bomb NYC . Susan Candiotti , more than a half million , was `` more lucid '' the second time he was interviewed , police say .