Windsor Police Service closed a portion of Howard Avenue while they searched for an injured person Saturday.
Listeners tell AM800 News a large trail of blood can be seen on the sidewalk from Giles Boulevard to Ottawa Street.
The Major Crimes Branch confirmed they were called to the scene after the blood was discovered around 3 p.m. but they're still searching for the injured person.
They're asking anyone with information to contact police or Crime Stoppers anonymously.