A third man was taken into custody on Thursday on suspicion of aiding Boston terror suspect Usaama Rahim, FBI spokeswoman Kristen Setera confirmed.
Nicholas Rovinski was arrested in Warwick by the federal investigation agency's Rhode Island Joint Terrorism Task Force shortly after 8 p.m. local time. Setera also confirmed that Rovinski was arrested without incident. However, she declined to provide details and referred further queries to the U.S. Attorney's office in Boston.
The third suspect is scheduled to be produced in U.S. District Court in Boston on Friday, where police will announce charges against him.
Last week, detectives searched Rovinski's Warwick-based home in wake of fatal shooting of Usaama Rahim, who was killed by members of the Joint Terrorism Task Force in Roslindale, Massachusetts on June 2.
Investigators believe that Rahim had originally planned to behead activist Pamela Geller, who last months organized "Draw Muhammad" competition in Garland, Texas, but later decided to behead a Boston police officer.
Recently filed court documents allege that Rahim came to Rhode Island to discuss the plot with David Wright, Rahim's nephew believed to be Rovinski.
Police believe that Wright pose a serious risk of fleeing or obstructing justice if not held in prison pending a hearing in his case. But, Wright's attorney Jessica Hedges argued that his client has deep roots in the city as well as an "incredibly" loving family.
Meanwhile, Rahim's family has refuted police's claims that he was killed after he approached officers aggressively. The family argued that he hadn't broken any laws and that he had been walking toward a bus stop on his way to workplace.