Residents have reported plumes of black smoke in the Great Northern Terrace area off Canwick Road in Lincoln.
The clouds of smoke can be seen near to the railway line and the Tesco superstore.
Two Lincolnshire Fire and Rescue crews have been deployed to the scene.
The exact location and cause is unclear at this stage. A reporter at the scene has said that smoking lasted around ten minutes before disappearing.
It appeared to be coming from behind the Siemens site.
The cause and location have not yet been confirmed by fire crews.
One resident told The Lincolnite they believe a fire was started behind Washingborough Road, but that smoke was often seen in the area.