| Thousands of people fleeing fighting near Mosul have been arriving at camps in northern Iraq |
The humanitarian impact of a planned
offensive by Iraqi pro-government forces to retake the city of Mosul is
expected to be "enormous", the UN says.
| Iraqi forces plan to use Qayyarah and its airbase as a logistics hub for the wider Mosul operation |
| UN plans to set up new camps in the north depend on the availability of land and of funding |
- Iraq seeks help as it sets sights on Mosul
- Inside Mosul: What's life like under IS?
- Islamic State group: The full story
Earlier on Tuesday, elite troops launched an operation to recapture the key town of Qayyarah, 60km (40 miles) to the south.
A spokesman for the Counter-Terrorism Service (CTS), Sabah Numan, said its forces were battling IS militants on the town's outskirts and were working in co-ordination with armed residents inside.
Pro-government forces have been preparing to move on Qayyarah for weeks, after recapturing a nearby airbase that will be used as a logistics hub for the wider offensive on Mosul.
The town's mayor, Saleh al-Jubouri, said an estimated 15,000 civilians were trapped there, but that most of the militants had fled or been killed.