FBI Issues Alert for Explosives Suspect The FBI is looking for Ryan Kelly

Chamberlain, wanted for possession of explosive materials in his San Francisco apartment.
1:26 | 06/01/14

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Transcript for FBI Issues Alert for Explosives Suspect The FBI is looking for Ryan Kelly
All right, bazi, thank you. Next, to an FBI alert across the country tonight. To be on the lookout for a man considered to be armed and dangerous. This after federal agents found explosives in a San Francisco apartment. The man who lived there, long gone. Here's ABC's senior justice correspondent Pierre Thomas now. Reporter: At this San Francisco apartment, FBI agents were exercising extreme caution, protecting themselves against possible biological toxins, deadly chemicals, even radiation. The FBI claims it did find something dangerous. And now agents want to talk to the man who lived there. The FBI is currently looking for a man by the name of Ryan Kelly chamberlain for possession of explosive material at his residence. Reporter: Authorities are asking for the public's help to find chamberlain. He's considered armed and dangerous. Last seen south of San Francisco, driving a white 2008 Nissan ultima. Reporter: But while the FBI wants police to use caution if they encounter chamberlain, right now, there's no information he's planning an attack. No threat to public safety that we know of. Reporter: A sign of the times. My sources say they can't yet determine if chamberlain is planning to harm anyone or himself. But these days, no one is willing to take any chances. David? All right, Pierre Thomas live in our Washington bureau tonight. Pierre, thanks.

This transcript has been automatically generated and may not be 100% accurate.

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