Al-Qaeda terrorists have threatened to unleash a "nuclear hellstorm" on the West if their leader and world's most wanted terrorist Osama bin Laden is nabbed.

A senior al-Qaeda commander has claimed that the terror group has stashed away a nuclear bomb in Europe which will be detonated if bin Laden is ever caught or assassinated, according to new top secret files made public by internet whistleblower WikiLeaks.

The documents are secret details of the background to the capture of each of the 780 people held at or have passed through the Guantanamo Bay detention camp in Cuba, along with their medical condition and the information they have provided during interrogations.

The documents have been released to select European and US news outlets and reveal that the day 9/11 terror killings took place in United States, the core of al-Qaeda was concentrated in a single city of Karachi in Pakistan.

The author of September 11 attacks watched the horrifying scenes of the planes crashing into the twin towers of World Trade Centre beamed live on TV with key al-Qaeda commanders at a safe house in Karachi.

While in a nearby hospital, the accused mastermind of the bombing of USS' Cole off Yemen waters was recovering from an tonsillectomy, the alleged organiser of the 2002 Bali bombing was buying lab equipment for a biological weapons programme.

Within a day much of the al-Qaeda leadership disappeared back to Afghanistan to plan for a long war, the Washington Post reported quoting the fresh leaks on whereabouts of the international al-Qaeda terror brigade.

The cache of classified military documents portray the planning of the 9/11 terror attacks and whereabouts of its plotters including the world's most wanted terrorist Osama Bin Laden and his deputy Ayman al-Zawahiri on that fateful day.

The Guantanamo detainees are assessed "high or medium or low" in terms of their intelligence value and the threat they pose while in detention and the continued threat they might pose if released.

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