From [1] IANS, with thanks to Fanabba:

WASHINGTON: Pakistan and Russia are two nations that could be potential sources of leaking nuclear weapons technology or fissile materials to terrorists, according to a new report by the Congressional Research Service (CRS) on nuclear terrorism.

"The fear regarding Pakistan is that some members of the armed forces might covertly give a weapon to terrorists or that, if President Musharraf were overthrown, an Islamic fundamentalist government or a state of chaos in Pakistan might enable terrorists to obtain a weapon," the report said.

"Terrorists or rogue states might acquire a nuclear weapon in several ways. The nations of greatest concern as potential sources of weapons or fissile materials are widely thought to be Russia and Pakistan," it added.

Pakistan, a close ally of the US in the war against terrorism, has often been described by South Asia experts as a "potential source" of radicalism, proliferation, terrorism and even nuclear war.