Investigators as part of a Hazardous Materials team had to shut down part of Rideau St. Saturday night just east of Elgin after reports of a possible chemical scare.
Police would only say they are investigating an incident but did not provide many details.
Reportedly, a bus driver had to be treated after a possible reaction to an undisclosed substance. CTV also heard that two paramedics were assessed after potential exposure.
Roads were closed for at least two hours but reopened before midnight.
Ottawa police said they were waiting for test results to see if the material was indeed something of a dangerous nature.
More to come…