New clues about Stuxnet provide the strongest evidence yet that the superworm targeted a nuclear enrichment plant in Iran, according to a new report.

The clues come from surveillance cameras installed by international investigators at the Natanz enrichment plant in Iran – which show Iranian workers feverishly replacing damaged equipment during the time Stuxnet is believed to have attacked the plant. Other clues appear in the attack code itself, showing that the worm targeted a configuration that researchers now say match precisely the centrifuge setup at Natanz. And still more clues are found i...