Last week, Indonesia was swept with a wave of terror attacks. The most recent attack took place on 16 May, when four sword-wielding insurgents attacked officers at Riau police headquarters in Sumatra. Prior to that, Surabaya – Indonesia’s second largest city – was targeted with a string of bombings. On 9 May, a family of suicide bombers attacked three churches in Central Surabaya, killing at least 15 people.