Its been two years since a campaign of brutal violence and mass rape forced almost a million Rohingyas to flee Myanmar. The International Criminal Court has now agreed to investigate possible crimes against humanity committed against them. In the weeks leading up to this major development, Sarah Dingle travelled to the world's biggest refugee camp in neighbouring Bangladesh, where close to one million asylum seekers are being hosted. But as she discovered, compassion is turning into resentment as tensions simmer among locals.