Police officers and paramedics rushed to Hermit Street, off Portland Street, in Lincoln this morning.
Several police cars, a dog unit and an ambulance pulled up outside the Hermit Street flats at around 8.45am on Tuesday, September 25.
Residents watched as officers entered a flat on the street. The dog unit van was parked at the back of the building.
It is believed it may have been a hoax call.
A spokesperson for EMAS said: “We received a call at 8:18am to an incident in Lincoln. We sent a paramedic in a fast response vehicle and a double crewed ambulance. We worked closely on scene with Lincolnshire Police, no patients were found.”
Lincolnshire Police have been approached for a comment, but have not responded at the time of publishing.