The Federal Bureau of Investigation said Wednesday it arrested Silk Road owner, Ross William Ulbricht, 29, known online as "Dread Pirate Roberts," in San Francisco on Tuesday, according to court filings. Ulbricht, who holds an advanced degree in chemical engineering, appeared in federal court on Wednesday and a bail hearing was set for Friday. His lawyer Brandon LeBlanc, a public defender, declined to comment. Federal prosecutors in New York charged Ulbricht with one count each of narcotics trafficking conspiracy, computer hacking conspiracy and money laundering conspiracy, the filing said. "Silk Road has emerged as the most sophisticated and extensive criminal marketplace on the Internet today," FBI agent Christopher Tarbell said in the criminal complaint.