Four people were taken to hospital after a blaze in a first floor flat.
Residents of Post Office Close, Corby, described a scene of glass shattering and flames licking out of a window after the large fire broke out on Saturday morning.
Firefighters rescued one man from the flat, off High Street, at about 10.15am.
The man was treated for burns and smoke inhalation at Kettering General Hospital, while the three other residents were also taken to hospital and checked over because they had breathed in smoke.
The first and second floors of the building suffered extensive damage in the blaze.
Firefighters and police forensic teams were yesterday still working together to investigate the cause of the fire.
Post Office Close residents had reported some issues with noise from the property.
Harry Smith, 71, said: “On New Year’s Day I had heard a lot of shouting and banging at the door there.
“I came out and smelled smoke at quarter to six on Friday, and the next morning I saw it like this.”
David Hadden, 72, said: “I was looking out of the window because the smoke was so heavy.
“It was choking and the flames were flying out of the window.
“It is normally a quiet neighbourhood. I have been here since 1964 and have never had any trouble.”