San Francisco, Calif. -- An FBI manhunt is underway for a California man considered armed and dangerous.
The nationwide search for 42-year-old Ryan Kelly Chamberlain was launched over the weekend after a search of his San Francisco apartment turned up explosive material.
Officials will not say what the chemical is, only that if not handled correctly, it's potentially deadly.
Authorities will not comment on the intent or motive behind the possession of the explosive material.
Chamberlain reportedly works as a social media consultant with experience working on political campaigns.
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