Berlin/Washington, Dec 13 (DPA) The European websites of online retailer Amazon were knocked out for hours Sunday night, amid attacks in recent days on other companies that have stopped doing business with the embattled WikiLeaks organization.

In Germany, attempts to view the Amazon.de website resulted in error messages. The world's largest internet retailer also saw its servers in Britain, France and Italy similarly affected, though the websites were viewable again late Sunday.

Amazon's US websites appeared unharmed, and the company issued no immediate statement about the incident, which follows hacking attacks last week on the websites of Visa, MasterCard and PayPal.

The credit card and online-payment firms had recently refused to handle donations to WikiLeaks, which has been posting some 250,000 US diplomatic cables on the internet to the consternation of Washington and scores of other governments. Those denial-of-service attacks, in which the websites are bombarded by requests for information, were claimed by a group of WikiLeaks sympathizers known as Anonymous.

Similarly, Amazon, which is also a major provider of online commercial services, recently withdrew server space that was used by WikiLeaks. Amazon cited alleged illegal activity by the website.

Amazon and the other firms insist that their recent actions against WikiLeaks were not the result of any US or other government pressure.

WikiLeaks founder Julian Assange is currently jailed in London over an arrest warrant issued in Sweden, where prosecutors are investigating alleged sex crimes. Assange's lawyer, Mark Stephens, said in a German media interview published Sunday that the case was part of a US-led conspiracy.