Remembering 22 colleagues killed by the “horrific terrorist attack” on the United Nations headquarters in Baghdad 15 years ago, Secretary-General António Guterres has called on all staff to pay tribute to the fallen by “continuing their mission,” and keep going to “dangerous places with the aim of making them safer”. Remembering 22 colleagues killed by the “horrific terrorist attack” on the United Nations headquarters in Baghdad 15 years ago, Secretary-General António Guterres has called on all staff to pay tribute to the fallen by “continuing their mission,” and keep going to “dangerous places with the aim of making them safer”.