Officers with the Winnipeg Police Service's identification unit outside a building on the 300 block of Assiniboine Avenue on Tuesday night. (Kiran Dhillon/CBC)

Winnipeg police are saying little about an investigation going on Tuesday evening at a downtown apartment building.

Members of the police service's identification unit have been seen at the residential complex on the 300 block of Assiniboine Avenue, near Hargrave Street.

Police confirm that officers have been there since midday, but they would only say they're investigating "suspicious circumstances."

More information is expected to be released on Wednesday.