Witnesses say a man was stabbed on Rideau Street, across from the Rideau Centre Thursday evening.
Ottawa Police and Paramedics responded to a call around 6:00 p.m.
A 19-year-old man was taken to hospital. Ottawa Paramedics say he suffered injuries to his upper-back and is in stable condition.
Witnesses describe a suspect "coming out of nowhere" and attacking the victim before fleeing.
Rideau Street remains open to bus traffic as Ottawa Police investigate.
With files from CTV's Annie Bergeron-Oliver.