This article by UPI correspondent Richard Sale says the US government is concerned that Al Qaeda may be in possession of a nuclear device: Fear of bin Laden nukes.

The Bush administration believes that bin Laden — the prime suspect in the Sept. 11 terror attacks — may be in possession of one or more small, portable nuclear weapons, according to one former senior U.S. intelligence official. Other experts agree that the danger is real. “We’re not at all discounting that possibility,” agreed Rose Gottemoeller, senior associate and Russian weapons expert at the Washington-based Carnegie Endowment for International Peace.