ACAPULCO, Mexico — Gunmen killed six people, including a local police chief, in a series of attacks Monday in mountain towns in the Pacific coast state of Guerrero. The police chief of Pungarabato was repeatedly shot while driving his red Mustang on a highway near the small town early Monday, Guerrero state public safety department said in a news release. Five other men were found gunned down in different towns in the isolated mountainous zone known as the Tierra Caliente, or the Hot Land, the state police said. In the border city of Tijuana, soldiers detained 60 people at a...