Computer hackers suspected of working from Russia successfully penetrated Pentagon computer systems in one of the most severe cyber attacks on US military networks, according to reports.

The electronic attack was so serious that Admiral Mike Mullen, the chairman of the joint chief of staff, briefed President George W Bush and Robert Gates, the defense secretary. "This one was significant, this one got our attention," said an official, speaking anonymously.

Read full story: Telegraph.co.uk

Related topics: Cyberattack, Cybercrime, Security