Al Qaeda will “almost certainly” seek revenge after their leader Osama bin Laden was killed in a US-led operation in Pakistan, the head of the CIA has warned.

The man who masterminded the September 11 attacks was buried at sea in the early hours of this morning, after he was shot dead at a villa in the town of Abbotabad.

“Though Bin Laden is dead, al Qaeda is not. The terrorists almost certainly will attempt to avenge him,” said CIA Director Leon Panetta.

Blood-stained carpets, stripped beds and emptied drawers can be seen in footage filmned inside the villa by American broadcaster ABC News following the raid.

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