The two men arrested with the material were released due to lack of evidence and have since disappeared, Dilek said.
Okay, a secret tip leads to the arrest of two men and some radioactive material.
Then they are released because there isn't any evidence?
Former U.N. weapons inspector David Albright suggested the men could have been trying to swindle potential buyers. But he said investigators should try to determine both the source and the intended purchaser.
Hmmmm, that might be a little more difficult now that the men have been released and have disappeared.
"If this is real, it is frightening," said a U.S. official familiar with the discussions. "But it is best now that we all look at this with a fair amount of skepticism until we know what it is that they have."
I'll agree with this. Which is why I find it extrememly strange that the men were released so quickly.