Ottawa Police say they’ve ended an investigation that prompted an evacuation of Parliament Hill Saturday afternoon.

The force says it has not identified a public safety threat stemming from the incident, adding roads previously closed to the public have now been reopened.

The Parliamentary Protective Service ordered the evacuation hours earlier, issuing an alert to all Parliamentarians and staff and noting all buildings in the precinct were to be under shelter in place orders until further notice.

It said the alert concerned a police operation involving a “possible threat,” but offered no other details.

Ottawa police were similarly tight-lipped, saying only that they were investigating a “suspicious incident.”

Neither police nor the Parliamentary Protective Service immediately responded to questions on the nature of the operation.