BOSTON -- FBI investigators are now looking for more victims after arresting a Massachusetts father of three in connection with an alleged online teen pornography case that they say netted victims nationwide.

Lawrence Joseph Silipigni, 41, of Saugus, is scheduled to appear in Federal Court in Los Angeles Thursday, charged with posing as a 17-year-old boy he met online to lure young girls to engage in online relationships.

Prosecutors allege that Silipigni, a married father of three, downloaded pictures from the boy’s social networking site without the boy’s knowledge and then used the images to represent himself as a young male in order to appeal to minor girls.

They said they found hundreds of computer videos of young girls between the ages of 10 and 16 at his home when it was searched in September.

Silipigni allegedly enticed young girls to engage in sexually explicit conduct in front of their webcams, then captured the video recordings and, in many cases, uploaded the child pornography to the Internet.

Silipigni allegedly also traded the recordings in exchange for similar illegal pornographic material. He allegedly threatened to notify victims’ parents when they resisted further communication after learning his true age and identity, and when they did not want to comply with his requests.

Silipigni was taken into custody Sept. 18 by Boston FBI agents on charges of enticing a minor to engage in sexually explicit conduct for the purposes of producing child pornography.

The feds began investigating the case when a California teenager went to police. She told them a Boston-area teen had met Silipigni and discovered he was not a 17-year-old named "Jamie" but a married man in his 40s.