Police assisted Cleveland Fire Brigade with an incident on Costa Street at 1:30pm today, Friday 2nd April.
A report of a fire was called into police which is currently being treated as unexplained.
A woman in her 40s has been taken to hospital with serious injuries.
Police remain at the scene of the fire whilst enquiries continue.
Officers are appealing for anyone with any information regarding the incident to contact Cleveland Police on 101 quoting 051406.