A journalist has been shot dead in crime-ridden northern Mexico, authorities said Friday, the sixth such murder this year in one of the world’s most dangerous countries for reporters. Chihuahua state governor Javier Corral condemned the “cowardly” killing of Arturo Alba Medina in Ciudad Juarez near the US border. Corral said on Twitter that he had told prosecutors to ensure the perpetrators are punished, adding: “Justice will be done.” The 49-year-old journalist and television news show host was assassinated a few minutes after the end of his program on Thursday night, according to media watchdog Reporters Without Borders. “This was clearly an execution and his media colleagues where he worked are afraid and don’t know the reason for the crime,” Balbina Flores, RSF representative in Mexico...