A road had to be closed near Northampton town centre after reports of a building fire.
Two fire engines were sent to Victoria Gardens following reports of flames coming from a building close to the Morrison's supermarket.
Traffic was held in both directions at the junction with Victoria Promenade while emergency services attended the scene.
Firefighters were seen entering a terraced house in Victoria Promenade shortly afterwards.
A spokeswoman for Northamptonshire Fire and Rescue Service has now confirmed the incident was a "mattress fire in a ground floor room".
The flames were extinguished before the fire could spread and no one was injured in the incident.
Traffic is clearing on the surrounding road network now as the roadblock has been lifted.