HispanicBusiness

A 'lone wolf' attack by an individual terrorist could pose the greatest threat to the London Olympics, experts said in a report Thursday.

Jonathan Evans, the chief of domestic intelligence service MI5, said the Games would not be an "easy target." But there was "no doubt" that terrorist groups had considered whether they could "pull off an attack."

"The dog you haven't seen may turn out to be the one that bites you," said Evans.

Lone individuals sympathetic to the cause of al-Qaeda are thought to be a source of major concern.

"The threat posed by so-called 'lone wolf' terrorists - who act independently rather than as part of a militant group - is of particular concern to the security services, in part because the threat is so hard to quantify," said terrorism expert Will Hartley.

He said Anders Behring Breikvik's rampage in Norway last year had "amply demonstrated" the harm that such individuals could inflict.

"Although by definition the lone wolf threat is unpredictable ... in the UK (United Kingdom) the clearest threat is posed by aspiring jihadists who align themselves with the transnational militant Islamist movement," said Hartley, of Jane's Terrorism and Insurgency Centre.