(NEWSER) – From Feb. 20 to March 4 of last year, the FBI ran one of the largest child pornography sites on the dark web—a section of the Internet where people usually operate with anonymity—with the goal of using security-cracking software to identify users. Early last year, the site known as Playpen was traced to computers servers located in North Carolina; the FBI in February relocated the site to its own location in Newington, Va.

Though the FBI didn't actually upload illicit content to the site, the FBI also didn't attempt to hide 9,000 downloadable images and videos and links to thousands more. The secret operation allowed agents to identify computer addresses for 1,300 of 100,000 users who visited the site over 13 days; 137 have since been charged, reports USA Today.

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