Amazon.com Inc. forced WikiLeaks to stop using the U.S. company's computers to distribute embarrassing State Department communications and other documents, WikiLeaks said Wednesday.

The ouster came after congressional staff had questioned Amazon about its relationship with WikiLeaks, said Sen. Joe Lieberman, an independent from Connecticut.

WikiLeaks confirmed it hours after The Associated Press reported that Amazon's servers had stopped hosting WikiLeaks' site. The site was unavailable for several hours before it moved back to its previous Swedish host, Bahnhof.