Manhunt target Ryan Chamberlain blames influence of Breaking Bad

A San Francisco man who sparked a US manhunt after explosives were found in his apartment attempted to explain himself by saying he binge-watched dark television series and "let Walter White get to me".

In notes the 42-year-old media consultant posted online while being hunted by the FBI, he said he had been influenced by the Breaking Bad title character, who transforms from a clean-cut chemistry teacher into a drug kingpin.

"I explored some ugly websites, a year-ish ago. I was depressed. I let Walter White get to me. I thought I was done. That's it. No one was ever in danger. And recently I was all better," read part of one note posted on Facebook and Twitter.

The three-day search for Ryan Chamberlain kicked off after federal agents, police, firefighters and hazardous material specialists allegedly found explosive materials in his Russian Hill apartment on Saturday local time.

Mr Chamberlain, a social media expert, was not at home and authorities called for public assistance to find him, saying he should be considered armed and dangerous.

"Anyone who has the means, methods and access to make a bomb should be considered armed and dangerous," FBI spokesman Peter Lee said.

There were early reports that a significant amount of the poison ricin, the killing-method Walter White preferred because it is hard to detect, had been found but these were later dismissed.

On Monday, Mr Chamberlain's first note, an apparent suicide letter which had been timed on a Hootsuite delay, appeared on Facebook with the title "Goodbye".

"So much was broken from this past year-and-a-half, and from moments way back before that," the three-page letter said. "I guess it was just insurmountable, and the time's up.

"I got dark. I got real dark. I explored myriad ways I could put an end to what I was going through. I binged-watched dark TV, sometimes didn't get off the couch for days, and scoured the Internet absorbing fuel for morbid fantasies."

Later the same day, Mr Chamberlain posted an accompaniment to his note, where he wrote media reports about him were incorrect and offered an apology to "everyone".

"A panicked update to my letter that should have posted by now. Nothing they're reporting is true. No 'stashes.' Not 'armed and dangerous.' No car 'rigged to explode'," read part of the note posted on Facebook and Twitter.

The FBI arrested Mr Chamberlain on Monday night after his car was found near the Golden Gate Bridge.

Media reports said he was booked on suspicion of possessing explosives in violation of federal law and a police robot was used to search his car.

"He looked pretty surprised and frantic," an Uber rental driver who recognised Mr Chamberlain from media photographs told the San Francisco Chronicle.

Mr Chamberlain is expected to make his first appearance in a federal court on Tuesday.

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