Firefighters were called to tackle a large blaze at a hotel in Corby.
About 40 firefighters went to the scene of the fire which broke out at about 3.45pm at the Hampton By Hilton Hotel in Princewood Road yesterday (Saturday).
The police and ambulance service were also at the scene.
Four people were treated for smoke inhalation at the scene.
All the hotel guests were re-located.
A spokesman for the fire service said an investigation into the cause of the fire had been launched.