From ArsTechnica:

Turns out the FBI isn’t the only agency to take over a child pornography website and bust some of its participants. Australian authorities have apparently employed similar tactics against Americans—revealing at least 30 targets.

According to Vice Motherboard, which first reported the story on Monday, Queensland Police Service’s Task Force Argos identified the owner of a Tor-hidden child porn site called “The Love Zone.” Queensland Police posed as The Love Zone for several months in 2014. (The Love Zone’s Australian owner, Shannon McCoole, is currently serving a 35-year sentence.)

Once they had control, Aussie cops seem to have sent out a child porn video file as bait to users of the site.

As was explained in a court filing in a July 2015 case involving a North Carolina man named David Lynn Browning:

When a user clicked on that hyperlink, the user was advised that the user was attempting to open a video file from an external website. If the user chose to open the file, a video file containing images of child pornography began to play, and the [foreign law enforcement agency] captured and recorded the IP address of the user accessing the file. FLA configured the video file to open an Internet connection outside of the Network software, thereby allowing FLA to capture the user’s actual IP address, as well as a session identifier to tie the IP address to the activity of a particular user account.