Police today appealed for information after a house was set on fire in Sunderland.
The fire happened at about 7.10am yesterday in Princess Street, near the city centre.
Damage was caused to a room in the property and three men were taken to hospital.
One, a 29-year-old, suffered burns and is still receiving treatment, though his condition is not thought to be life-threatening.
Two other men were released after treatment for breathing difficulties.
Inquiries suggest the fire was started deliberately and it is being treated as arson.
A 29-year-old man has been arrested and bailed pending further inquiries.
Any witnesses are asked to contact Northumbria Police on 101, ext 69191, or Crimestoppers anonymously on 0800 555 111.