The mayor of a city in southern Mexico has been murdered less than a week after taking office, authorities said Sunday, the latest in a series of attacks on politicians in the violence-plagued Latin American country. The killing of Chilpancingo mayor Alejandro Arcos "fills us with indignation," Guerrero state governor Evelyn Salgado wrote on social media, without providing further details of the circumstances. Local media reported that Arcos was decapitated, but there has been no official confirmation. Reuters reported that photos circulating on WhatsApp showed a severed head on top of what appeared to be Arcos' vehicle, but the news...