Nationwide Search For Man Known To Carry Explosives

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SAN FRANCISCO (AP) - The FBI has issued a nationwide alert to law enforcement agencies about a man they consider armed and dangerous who is wanted for investigation of possessing explosives.

FBI spokesman Peter Lee says 42-year-old Ryan Kelly Chamberlain of San Francisco was last seen in a dark blue, hooded sweatshirt.

Multiple agencies, including hazmat crews, searched Chamberlain's apartment Saturday in San Francisco's Russian Hill neighborhood.

Lee gave no details Sunday about the nature of the investigation, but said authorities believe Chamberlain is acting alone.

Lee says Chamberlain is traveling in a white 2008 Nissan Ultima with Texas license plates.

The search warrant used to enter his home remains under seal.

The street where the search took place was cordoned off for more than 14 hours Saturday.