U-S Defense Secretary Donald Rumsfeld says the United States has bombed terrorist sites in Afghanistan that may have been involved in producing weapons of mass destruction.
He says some of those sites may have been missed, but Mr. Rumsfeld and other U-S officials say they doubt Osama bin Laden and his al-Qaida network have a nuclear weapon.
Officials from Pakistan, Russia and Britain have also expressed doubt that al-Qaida has the capability to build a nuclear bomb.
Still, National Security Advisor Condoleezza Rice told U-S television Sunday the United States is doing everything it can to prevent al-Qaida from acquiring weapons of mass destruction.
Saturday, a Pakistani newspaper -- the English language Dawn -- published an interview in which Osama bin Laden threatens to use nuclear and chemical weapons against the United States -- if such weapons are used against him.
In the second part of the interview published Sunday, Osama bin Laden is quoted as saying he has nothing to do with anthrax attacks in the United States. He also says he will never allow himself to be captured.
Meanwhile, a British newspaper says Osama bin Laden has accepted responsibility for the September 11th terrorist attacks on the United States, and is threatening to kill more civilians.
The Sunday Telegraph says the Saudi fugitive's admission came in a video it says was made in Afghanistan at the end of October and is circulating among supporters of his al-Qaida network.