Visitors hoping to browse the site's licentious listings were instead greeted by a Department of Justice takedown notice.
"Backpage.com and affiliated websites have been seized as part of an enforcement action by the Federal Bureau of Investigation, the U.S. Postal Inspection Service, and the Internal Revenue Service Criminal Investigation Division, with analytical assistance from the Joint Regional Intelligence Center," the announcement read.
FBI agents, meanwhile, descended on Backpage co-founder Michael Lacey's Sedona home, according to Evan Wyloge of the Arizona Center for Investigative Reporting.
Lacey's neighbors who witnessed the raid said "about 20 undercover cops" swarmed the property, according to Wyloge.