America's new cyber attacks on Middle East

Researchers have found evidence suggesting the United States may have developed three previously unknown computer viruses for use in cyber warfare.

Anti-virus software makers Symantec of the US and Kaspersky Lab of Russia say about a dozen computers in Iran and Lebanon are infected. The researchers say the malware fits the profile of military operations.

The US has already been linked to the Stuxnet Trojan that attacked Iran's nuclear programme in 2010 and the Flame cyber surveillance tool that was uncovered in May.