Guess it depends on what they mean by "looked like". If they mean it gives off signals that would look radioactive to the detectors, then yeah that's an issue. If they mean looked like to the eye, then you're left with all the points NEOWatcher made, and someone should inform the reporters that not all nuclear materials come in barrells with the biohazard symbol clearly stamped on the side.

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I'm like one of those idiot savants...well, except for the savant part.

Theory of Zombie Relativity:
1) Everyone Else is a Zombie relative to You
2) Whether or not it matters is related to the inverse square of the distance between their teeth and your brain
(Quoted from Demigrog)