The agency was able to accomplish this using a hacking method to track IP addresses on the Dark Web.
The NIT identified at least 1,300 IP addresses belonging to visitors of the site.
source: www.techworm.net
FBI give 1,500 Pedophiles a slice of justice as its hacks site on Dark Web
FBI was able to hack a website present on the Dark Web and arrest 1,500 pedophiles responsible for running a child pornography website
