Security scare: Facebook blocks access to NBC.com

Facebook Inc has blocked users from accessing the NBC.com website following reports that the site is infected with a computer virus. Facebook users were told "This link has been reported as abusive" on Thursday when they attempted to access the NBC.com website.

Several security bloggers warned on Thursday that the site was infected with malicious software, advising computer users to avoid the site.

US media company NBC Universal said late on Thursday that its NBC.com website was safe to visit following a security scare prompted by reports that it was infected with malicious software designed for banking fraud and cyber espionage.

"A problem was identified and it has been fixed," an NBC Universal spokeswoman told Reuters. She declined to elaborate on the nature of the problem.

The Dutch computer security firm SurfRight said on its HitmanPro blog that the site of its NBC television network was tainted with viruses known as the Citadel and ZeroAccess that are used for banking fraud, cyber espionage and other computer crimes.

The NBC spokeswoman said she could not confirm whether any users had been infected. But she said that no account information about users of the site had been compromised.

NBC is controlled by Comcast Inc, which is buying out minority owner General Electric Co.