A portion of a busy roadway in Old St. Vital was closed Thursday morning while police investigated a serious assault.

Shortly after 5:30 a.m., officers responded to the 500 block of St. Mary's Road where they located an injured adult male.

The man was transported to hospital in critical condition and has since been upgraded to unstable condition.

Officers shut down northbound St. Mary's Road at Essex Avenue for just under three hours. It has since been reopened.

There is no word on a suspect at this time. 

The investigation is ongoing.