19 October 2011 Last updated at 08:25 ET

Researchers warn of new Stuxnet worm

Stuxnet seems to have been designed to target uranium enrichment systems

Researchers have found evidence that the Stuxnet worm, which alarmed governments around the world, could be about to regenerate.

Stuxnet was a highly complex piece of malware created to spy on and disrupt Iran's nuclear programme.

No-one has identified the worm authors but the finger of suspicion fell on the Israeli and US governments.

The new threat, Duqu, is, according to those who discovered it, "a precursor to a future Stuxnet-like attack".

Its discovery was made public by security firm Symantec, which in turn was alerted to the threat by one of its customers.

The worm was named Duqu because it creates files with the prefix DQ.

Symantec looked at samples of the threat gathered from computer systems l