SPRINGFIELD -- An Adams man is being held without bail and is set for a detention hearing today in federal court after his arrest by federal agents on child pornography charges.

William Guinan, 53, was arrested last Thursday after agents from the federal Department of Homeland Security raided his house, confiscated a computer and allegedly discovered a cache of child pornography on the machine.

According to the criminal complaint, Guinan admitted he downloaded child porn because he found it "titillating," but said he did not act on his desires or seek out children.

Guinan's arrest came after a federal investigation into the exchange, distribution and possession of child pornography through an online peer-to-peer file-sharing program.

Guinan is facing a single count of receiving material involving the sexual exploitation of a minor. He has not yet been indicted on the charge.

According to court filings, Guinan is scheduled to appear in U.S. District Court in Springfield with his court appointed attorney, Elaine Pourinski, to argue on whether Guinan should be held pending the outcome of his case.

A call to the attorney was not immediately returned.

Guinan's arrest late last week was the second such arrest in Berkshire County recently.

Dalton resident Jared Sprague, 25, who was arrested by federal agents on Nov. 26 after the home where he lives was also raided, is out on a $35,000 unsecured bond with a long list of conditions that includes no contact with children under 18 unless accompanied and supervised by an adult who is aware of the charges, home detention with electronic monitoring, and refraining from possessing any device that can connect to the Internet, among other restrictions. Sprague is represented by attorney Leonard H. Cohen.

If convicted, both defendants face a mandatory minimum of five years and up to 20 years in prison to be followed by up to a lifetime of supervised release and a $250,000 fine.