Mexican authorities say an investigation that began with an anonymous tip about kidnappings led to a grisly find: 32 bodies and nine severed heads. The remains had been buried in hidden graves in a remote, mountainous area of Guerrero state, a hotbed of drug-related violence. The victims and suspects have not yet been identified, state officials said in a statement Thursday. Authorities are still combing the area to see whether there are more hidden graves at the site, the statement said. The investigation began earlier this week after authorities, acting on a tip, found a man who'd been kidnapped and...