NEW : Ryan Kelly Chamberlain II was arrested in Crissy Field , a law enforcement official says . Chamberlain , 42 , was last seen Saturday south of San Francisco , the FBI said . Ryan Kelly Chamberlain II , Saturday , is accused of having explosive materials at his home . He was last seen 42 south of Crissy Field , according to the KTVU .
NEW : Ryan Kelly Chamberlain II was arrested in Crissy Field , a law enforcement official says . Ryan Kelly Chamberlain II , Saturday , is accused of having explosive materials at his home . He was last seen 42 south of Crissy Field , according to the KTVU .