Nuclear Scientists' Terror Links Probed

Pakistan has broadened its investigation of nuclear scientists suspected of having links to Osama bin Laden after receiving new information from the CIA, a senior Pakistani official said Sunday.

Two nuclear scientists are already in custody, and Pakistani officials are questioning at least two others about their possible links to bin Laden, the official said on condition of anonymity.

Suleiman Asad and Mohammed Ali Mukhtar have been ordered to report for questioning but are not in custody, the official said. Two others, Sultan Bashir-ud-Din Mehmood and Abdul Majid, were detained after CIA Director George Tenet visited this month.

They had been in custody since October but were released without charges before Tenet's visit.

Afterward, they managed a charity organization, Tameer-e-Ummah, or "Nation Builder", and had made several trips to Afghanistan, where they met bin Laden.