Investigators believe San Jose resident Richard Werner Schweich "was in the Santa Cruz area and may have contacted victims down there," said Hilary Rickher of the U.S. Postal Inspection Service.
San Jose police arrested Schweich, 39, in May 2009 on multiple sexual exploitation charges. Those include alleged child pornography violations listed in a sealed indictment, Rickher said.
Schweich was taken into custody after police received a report of a January 2008 incident that involved an 11-year-old girl.
Police said the girl reported that Schweich approached her in his car, saying he was a modeling agent. He then allegedly took her to a motel room in San Jose and took pornographic photos of her, according to police.
A similar incident was reported to police in 2007.
Representatives from the Santa Cruz County District Attorney's Office and the U.S. Postal Inspection Service are holding a news conference at 11 a.m. at the district attorney's office in Santa Cruz.
The U.S. Postal Inspection Service is the federal law enforcement agency responsible for child exploitation investigations involving U.S. mail and the Internet.
Schweich is being held in a federal detention center.