Australian authorities arrested and charged four US nationals accused of attempting to smuggle cocaine into the country, police said on Sunday. A 55-year-old US national is accused of “planning and supervising the transnational drug courier syndicate,” the Australian Federal Police (AFP) said in a statement. He was arrested in Melbourne days after he arrived from Los Angeles. The man allegedly oversaw three US women, aged 22, 24 and 35, travelling on a separate flight from Los Angeles to Melbourne carrying a combined 30 kilograms of cocaine concealed in their luggage, police alleged. Australia…