Boston Police Commissioner Ed Davis said on Monday that "powerful devices" caused the two blasts at the finish line of the Boston Marathon and noted that police did not have any suspects in custody at this time. "We are questioning many people but there is no suspect in custody," Davis said. He also noted that a fire at the John F. Kennedy Library, which he described as caused by an "incendiary device", may not have been linked to the marathon incident, which left two dead.
