FILE - This April 14, 2014 file booking photo released by the North Berkshire District Court in North Adams, Mass., shows Alexander Ciccolo, charged with drunken driving. Ciccolo, the son of a Boston police captain, was arrested July 4, 2015 in Adams, Mass., accused of plotting to detonate pressure-cooker bombs at an unidentified university and to broadcast the killings of students live online to show his support for the Islamic State group. Ciccolo is scheduled to make his initial appearance in federal court on Thursday, July 7, 2016, in Springfield, Mass., on a new indictment on terror-related charges. (Northern Berkshire District Court via AP, File)
FILE - This April 14, 2014 file booking photo released by the North Berkshire District Court in North Adams, Mass., shows Alexander Ciccolo, charged with drunken driving. Ciccolo, the son of a Boston police captain, was arrested July 4, 2015 in Adams, Mass., accused of plotting to detonate pressure-cooker bombs at an unidentified university and to broadcast the killings of students live online to show his support for the Islamic State group. Ciccolo is scheduled to make his initial appearance in federal court on Thursday, July 7, 2016, in Springfield, Mass., on a new indictment on terror-related charges. (Northern Berkshire District Court via AP, File) Credit: AP PHOTO

SPRINGFIELD — A Boston police captain’s son accused of plotting an attack on a college campus to support the Islamic State group pleaded not guilty to terrorism charges Thursday.

Alexander Ciccolo, 24, was arrested last July in a plot to detonate homemade bombs similar to the pressure cooker bombs used in the deadly 2013 Boston Marathon attack. Boston police Capt. Robert Ciccolo alerted the FBI after his son said he wanted to join the Islamic State group.

The younger Ciccolo was arrested after he allegedly received four guns from a person cooperating with the FBI.

He was charged then only with being a felon in possession of a firearm. But last week, he was indicted on one count each of attempting to provide material support to a foreign terrorist organization and attempting to use weapons of mass destruction.

Ciccolo’s lawyer did not immediately return a call seeking comment Thursday.

Ciccolo has been held without bail since his arrest. During a detention hearing last July, a prosecutor said Ciccolo “came under the sway” of the Islamic State group, accepted its “call to action” and began making plans to kill Americans.

Prosecutors said Ciccolo focused on a plan to set off a pressure cooker bomb in the cafeteria of an unidentified university during lunchtime so he could kill as many people as possible.

Ciccolo was briefly held at the Franklin County Jail and House of Corrections, where he allegedly stabbed a nurse in the head with a pen during intake.