In an audio message issued to the Pakistani media from an undisclosed location, Tehrik-e-Taliban Pakistan spokesman Ahsanullah Ahsan confirmed the death of bin Laden, the world's most wanted man, and said his group would take revenge for his killing.
"We will avenge the killing of Osama bin Laden.
Pakistan is now the first target of the Taliban and the US the second," said Ahsan, who spoke in Pashto.
He warned that Pakistan's leaders were on the Taliban's hit list.
In telephone calls to journalists in northwest Pakistan shortly after the US announced the killing of bin Laden yesterday, Ahsan warned that top Pakistani leaders, including President Asif Ali Zardari, and the Pakistan Army would be the "first targets" of his group.
Ahsan also said in his audio message that the US should not be jubilant about killing bin Laden as American authorities took 10 years to find the al-Qaeda chief.
"We killed former Prime Minister Benazir Bhutto (in 2007). After three months of planning, we sent a suicide bomber to kill her... We completed our objective in three months while the US was trailing Osama bin Laden for 10 years," he said.
US officials have often said that the Pakistani Taliban, led by Hakimullah Mehsud, has close ties to al-Qaeda.
Both groups have safe havens in Pakistan's tribal belt bordering Afghanistan, the American administration has said.