WARWICK, R.I. -- A second arrest has been made in connection with a terror plot uncovered in Boston, the FBI confirmed to CBS News late Thursday.
Nicholas Rovinski, 24, was arrested without incident at his home in Warwick, R.I., CBS News' Paula Reid reports. He is expected to appear in federal court Friday in Boston, when the charges against him will be announced, U.S. Attorney Carmen Ortiz's spokeswoman Christina DiIorio-Sterling said.
Rovinski's home was searched by the FBI and police last week as part of an investigation into the activities of Usaamah Rahim, who authorities say was plotting to behead police officers, according to CBS affiliate WPRI-TV in Providence.
Rahim was shot and killed in a Boston parking lot on the morning of June 2, allegedly after lunging at members of the Joint Terrorism Task Force with a knife as they tried to question him.
A nearby surveillance camera recorded video of the shooting, which was shown to Rahim's family and community leaders before being released to the public on Monday. His family denies that Rahim had been radicalized by the Islamic State of Iraq and Syria (ISIS).
Authorities have said the terrorism task force had Rahim under 24-hour surveillance and had intercepted conversations between Rahim and his nephew, David Wright, who was arrested on a charge of conspiracy with intent to obstruct a federal investigation after Rahim's death.
According to a criminal complaint filed against him, Wright and Rahim met with a third man on a Rhode Island beach shortly before the Boston shooting. Rahim had purchased three large military-style knives, allegedly to use as weapons, authorities said.
Rahim planned to carry out an ISIS-style beheading, possibly on controversial conservative activist and outspoken Islam critic Pamela Geller, CBS News correspondent Jeff Pegues reported Monday.
On May 3, Geller organized the Prophet Muhammad cartoon drawing contest in Garland, Texas, where police fatally shot two men who opened fire outside the event.
Geller told CBS News she has increased her security but has yet to discuss the threat with the FBI, calling herself "the number one target for ISIS right now."
Law enforcement sources are still unclear on how serious the plot against Geller was and how much of it was just talk.