They didn't know that they had Cobalt-60 on the college campus, which would have made a superb dirty bomb. They did get their hands on some Uranium, though. So

They didn't know that they had Cobalt-60 on the college campus, which would have made a superb dirty bomb. They did get their hands on some Uranium, though. So it is a relatively close call. To close to hand-wave away the possibility of terrorists or failed states abusing nuclear material.