Updated June 4, 2014: Chamberlain was captured on June 2 by the FBI and San Francisco Police Department.

The Federal Bureau of Investigation is seeking the public’s help in locating Ryan Kelly Chamberlain, II.

Chamberlain, 42 of San Francisco, is wanted for allegedly possessing explosive materials in his residence. He was last seen yesterday south of San Francisco.

Chamberlain is described to be a white male, 6’3” tall, and 225 pounds with brown hair and blue eyes. He was last seen wearing a dark blue sweatshirt and blue jeans driving a white 2008 Nissan Altima with either California or Texas license plates 7FQY085 and BX9M042, respectively.

The suspect should be considered armed and dangerous.

Anyone with information regarding the whereabouts of the suspect is urged to contact their nearest FBI office or dial 911. The FBI can be reached 24 hours a day at 415-553-7400 in the San Francisco area. All calls are confidential. Tips can also be submitted at tips.fbi.gov.

Members of the media in the San Francisco area should contact FBI Media Representative Peter Lee at 415-553-7450.