The official death toll stands at more than 3,300 – but the eventual count is expected to be far higher, with international aid groups giving estimates of up to 10,000 people missing. "An estimated 43,059 individuals have been displaced by the floods in northeastern Libya," the IOM said, adding that a "lack of water supply is reportedly driving many displaced out of Derna" to other areas.

For every Syrian who escaped the civil war in his or her homeland by crossing international borders, there are three more displaced within the country. Those who manage to leave become refugees. Those who stay behind remain invisible. But they are part of a growing population of refugees that are often without international support, a sub-group of people whose basic needs are rarely addressed by the global community: the internally displaced.