A man who was found injured outside in a Stobswell Street was rushed to hospital.
He was taken by ambulance to Ninewells Hospital but it was not known how he sustained his injuries on Friday night.
Police cordoned off a section of Pitkerro Road between Morgan Street and Baldovan Road after being called to the scene at 9.38pm.
Officers were in the area for around an hour and a half while scenes of crime investigators combed a block of flats opposite Morgan Academy.
Forensic teams spent over an hour in the property and were focused on a top floor landing window.
Pedestrians and traffic were stopped from entering the section while the investigation was ongoing.
A spokeswoman for Police Scotland would not confirm if the man’s injuries were life threatening or if anyone had been detained in connection with the incident.