A giant concrete block fell Sunday from the ceiling of an underground parking facility in Montreal's Olympic Stadium.
The city's fire department said no one was injured but they are concerned there could be more problems now that the structure has been weakened.
A security guard spotted the fallen slab — measuring eight by 12 metres — shortly after 3 p.m. and alerted emergency officials.
The incident at the old home of the Montreal Expos is the latest sign of the city's crumbling infrastructure.
It comes two weeks before the Montreal Impact is scheduled to play its first Major League Soccer game at the stadium.
Team spokesman Patrick Vallee said since the collapse was not inside the stadium the March 17th game against the Chicago Fire would go ahead as planned.
Stadium officials say they are investigating the incident.
Last fall, the Quebec government invited residents to come up with proposals for what to do with the seldom-used, billion-dollar stadium.