The FBI has shutdown Silk Road, the most popular online marketplace for drugs, and arrested the site's alleged founder — a man known as the "Dread Pirate Roberts" — who reportedly had millions of dollars' worth of Bitcoin.
FBI spokeswoman Kelly Langmesser confirmed both the seizure and the arrest during a phone call Wednesday. Langmesser said FBI agents arrested Ross William Ulbricht Tuesday at the Glen Park branch of the San Francisco Public Library at 3:15 p.m. local time.
"We're doing multiple searches on silk road severs and we're also in the process of seizing the Bitcoin," Langmesser told Mashable.

She said Silk Road operated from many servers around the world, and that the FBI is "working with those countries to get the servers." Langmesser estimated Ulbricht had as much as $4 million worth of Bitcoin at the time of the arrest.
While it was operational, Silk Road was only accessible through a Tor browser, software that facilitates anonymous web browsing. The combination of Tor, encryption and Bitcoin had allowed Silk Road to operate in plain view since 2011.
"This isn't a war on Tor," Langmesser said. "This is taking down a black market site that is selling drugs, guns, murder-for-hire services. This is a bad site that we took down ."
The criminal complaint against Ulbricht says he "solicited murder-for-hire of a certain Silk Road user, who was attempting to extort money from [Dread Pirate Roberts] at the time, based on a threat to release the identities of thousands of Silk Road users."
At the time the site was removed, it did not appear to allow for the sale of guns, though there are reports that it had in the past. A Forbes story from August that featured an exclusive interview with the "Dread Pirate Roberts" expanded on what the site's founder said he felt ethically comfortable selling.
"He won’t permit the sale of child pornography, stolen goods or weapons, though the latter is a gray area. The site has experimented with selling guns and may yet reintroduce them, Roberts says."
Drugs were widely available for purchase on the site, though. A vendor on the site who goes by "Angelina" said his or her company made nearly 10,000 drug sales in about a year and a half, a stat supported by that person's vendor page, visible when Silk Road was still functional.
"It runs like a small internet retailer/packing and shipping company," Angelina told Mashable through encrypted messaging on Silk Road. "We use accounting software to manage our finances and we pay taxes. We've built an order management system to track our inventory and shipping."
Though Langmesser said the FBI believes Ulbricht was working with others, no one else has been charged in the case at this time. Below is the full criminal complaint against Ulbricht.
Criminal Complaint Against Silk Road and Drad Pirate Roberts

Image: Chip Somodevilla/Getty Images; Silk Road Lorenzo Franceschi-Bicchierai contributed to this report.