SAN FRANCISCO (AP) — San Francisco police officers on Monday afternoon arrested a man with Iowa ties described as social media maven and former political consultant who was wanted by federal agents on suspicion of possessing explosives. A law enforcement official who spoke on the condition of anonymity because he was not authorized to speak publicly on the matter said 42-year-old Ryan Kelly Chamberlain II was spotted in his white car around 6:22 p.m. Monday near San Francisco’s Crissy Field, just south of the Golden Gate Bridge.