Washington (CNN) -- In a fast-moving child abuse investigation that started two weeks ago in Denmark, U.S. officials this week arrested a suspect in northern California and are now trying to determine whether there are additional child victims.
Federal authorities Thursday said they had arrested David John Stevens, 58, of Salinas, and believe him to be the man in four videos allegedly depicting sexual assaults on a young girl.
The girl, officials said, has been identified and protected. But based on interviews with witnesses, authorities "believe there may be additional unidentified child victims," the Immigration and Customs Enforcement agency said.
It could not be determined Thursday whether Stevens had an attorney.
The investigation was unusually quick, beginning May 4 when Danish National Police discovered four videos that had been posted on the Internet the previous day. Three videos were date-stamped April 14, and the fourth was dated April 27. Investigators were concerned that given the timeliness of the videos, the abuse might be ongoing.
Danish authorities, believing that the videos were shot in the U.S., shared them with ICE's Cyber Crimes Center, Child Exploitation Unit.
ICE investigators observed a Frito-Lay Rold Gold bag for thin pretzels in the videos. By studying Frito-Lay websites, they learned that Rold Gold pretzels are packaged differently within the United States and Canada. ICE investigators believe the bag is exclusively distributed in the United States.

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