In the highlands of Central Java, around 90 miles from the Indonesian capital of Jakarta, lies the sprawling city of Bandung. Surrounded by the lush Parahyangan Mountains, the city has long been popular as a hilltop resort. In the colonial period, its cool temperatures and picturesque views made it a favourite of Dutch officials hoping to escape the island’s relentless heat. In April 1955, however, the city transformed into a different kind of retreat.