Rio de Janeiro police officers are warning tourists that they’re on their own this summer as the Brazilian city struggles to cope with rising violent crime ahead of the 2016 Olympic Games. About 100 Rio state police officers protested last week in the arrivals hall of Rio’s main international airport holding banners that read “Welcome to Hell,” Agence France-Presse reported. “Police and firefighters don’t get paid, whoever comes to Rio de Janeiro will not be safe,” the sign said, CNN reported. “We are here to show citizens and tourists from abroad the realities of Brazil,” said veteran police Officer Alexander...