The United States Vice Presidential candidates on Thursday described an unstable Pakistan as extremely dangerous in their first live debate, with Democrat John Biden contending that its tribal areas and Afghanistan were the 'central front' of the war on terror and not Iraq, as projected by the Republicans.

At the face off with political novice Sarah Palin [Images] ahead of the November election. Biden, known for his deft understanding of international relations, warned that the next attack on the US is "going to come from al Qaeda planning in the hills of Afghanistan and Pakistan".

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He declared that his government will go after terror mastermind Osama bin Laden if there is actual intelligence.

In the first presidential debate last week, Democrat Barack Obama [Images] too said if the US had al Qaeda leaders and bin Laden in sight and Pakistan was unable or unwilling to act, "then we should take them out."

Asked which was the greater threat, a nuclear Iran or an unstable Pakistan, Biden said, "They're both extremely dangerous. Pakistan already has nuclear weapons. Pakistan already has deployed nuclear weapons. Pakistan's weapons can already hit Israel and the Mediterranean. "Iran getting a nuclear weapon would be very, very destabilising.... So they're both very dangerous. They both would be game changers," he said during the feisty debate in St Loius, Missouri.

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Biden said while Republican Presidential nominee John McCain [Images] was insisting "that the central war in the front on terror is in Iraq. I promise you, if an attack comes in the homeland, it's going to come as our security services have said, it is going to come from al Qaeda planning in the hills of Afghanistan and Pakistan. That's where they live. That's where they are."

"There have been 7,000 madrassas built along that border.... that's where bin Laden lives and we will go after him if we have actually intelligence," he added.

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Palin too agreed that a nuclear Iran or an unstable Pakistan were both extremely dangerous but said even Al Qaeda [Images] had declared Iraq as the central front in the war on terror.

In the Friday debate, Obama said Pakistan had failed to take strong action against militants despite the billions of dollars from the US after the 9/11 terrorist attacks. "They have not done what needs to be done to get rid of those safe havens," Obama said.

"If the United States has Al Qaeda, bin Laden, top-level lieutenants in our sights, and Pakistan is unable or unwilling to act, then we should take them out," he had declared.

McCain, however, was less aggressive. "You don't do that. You don't say that out loud. If you have to do things, you have to do things, and you work with the Pakistani government," the 72-year-old Vietnam veteran said.