FBI launches manhunt for San Francisco man wanted on suspicion of possessing explosives

The FBI has launched a nationwide manhunt for a California social media consultant who is wanted on suspicion of possessing explosives. Federal authorities, including a hazardous materials team, spent 16 hours Saturday searching the apartment of Ryan Kelly Chamberlain II and reportedly found explosive material.

KTVU-TV reports that Chamberlain taught a semester at the University of San Francisco in 2011 and previously worked for the Republican Party before switching to the Democratic Party a few years ago. Friends said they were "shocked" that he would be involved in something like this.

At a press conference Sunday, FBI spokesperson Paul Lee offered few details about the nature of the investigation, but said they consider 42-year-old Chamberlain armed and dangerous. "We believe he is alone in the vehicle but we just don't know, again, where his ties or his network is so we ask that any members of the public be on the lookout for anyone that matches this man's description," said Lee.

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Chamberlain, who was last seen south of San Francisco on Sunday, is 6' 3", weighs 225 lbs, and has blue eyes and brown hair. He's reportedly driving a white 2008 Nissan Altima with a California or Texas license plates of either 7FQY085 or BX9M042. -- Jordan Valinsky