Al Qaeda is close to producing radioactive weapons after getting nuclear material and recruiting rogue scientists to build "dirty bombs," according to information that the website WikiLeaks passed on to the London Telegraph.
One leading atomic regulator has warned of a "nuclear 9/11."
A dirty bomb could contaminate a targeted area, such as a city, for many years.
The report said jihadist groups are also close to making biological and chemical weapons that could kill thousands.
An Indian national security adviser told American security personnel in June 2008 that terrorists had made a "manifest attempt to get fissile material" and "have the technical competence to manufacture an explosive device beyond a mere dirty bomb."
Meanwhile, agents with the Federal Bureau of Investigation have tracked down a team of Qatarri men accused of providing aid to the 9/11 bombers.