WikiLeaks says it's under powerful cyber attack

The WikiLeaks website says it's under a forceful Internet-based attack, and the site is inaccessible to users in US and Europe.

The site, which just distributed a trove of US diplomatic documents, said in a Twitter message on Tuesday morning that it's under a "distributed denial of service attack," a method commonly used by hackers to slow down or bring down sites. The site was under attack Sunday, but Tuesday's attack appears to be more powerful. (AP)