It was told one man participated in a terrorist-run paramilitary camp in Pakistan, while three others received similar training in remote parts of Australia in preparation for an attack.
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It also watches for indications a bank is being monitored by hackers in preparation for an attack.
"One of the concerns of an attack like this is that the attacker is using a relatively weak botnet of home PCs in order to build a much larger botnet of beefy servers in preparation for a future attack, " he wrote in a blog post.
In the meantime, he said an assembly government emergency planning official inside the Cobra committee was providing regular updates, and Wales had already carried out an exercise in preparation for just such an attack.