The estranged son of a Boston police captain is facing charges that he was plotting an ISIS-style attack. 

Alexander Ciccolo, 23, of Adams, Mass., was arrested July 4 as part of a federal law enforcement effort to prevent attacks over the holiday weekend. 

Ciccolo is the son of veteran Boston Police Captain Robert Ciccolo, who was one of the first responders to the scene of the 2013 Boston Marathon bombing. 

Ciccolo, also known as Ali Al Amriki, was arrested on gun charges after he bought four guns from undercover agents.

He was then found to be in possession of potential bomb-making materials, including a pressure cooker, alarm clock and chemicals, and documents about waging "jihad."

Investigators believe Ciccolo wanted to attack an unidentified college's dormitory or cafeteria in which students would be murdered and the scene would be broadcast on the internet. 

The FBI claims Ciccolo was inspired to build a pressure cooker bomb by the Boston Marathon attack, ABC reported.

Fox News chief intelligence correspondent Catherine Herridge reported on the arrest this afternoon. She said the defense will likely argue that a confidential FBI informant entrapped Ciccolo and convinced him to plot an attack. 

But Herridge said Ciccolo's social media posts will be used by prosecutors. She said he recently posted video of the recent Tunisia terror attack, calling it "awesome."

Herridge reported that after Ciccolo was arrested, he stabbed a nurse with a pen, bloodying her head. 

Ciccolo remains in custody, with a detention hearing scheduled for Tuesday.

Last week, FBI Director James Comey said federal authorities had disrupted plots to kill Americans during the Fourth of July weekend.

Watch the report above from "Shepard Smith Reporting."