According to the STM service updates website, service on sections of three metro lines is currently interrupted.
An "intervention by emergency services" is the cause. There are few other details.
TLDR: Sections of the Green, Orange, and Yellow lines are down because of an intervention by emergency services. Service is so far projected to resume at 1:45 PM.
The Green line is down between Lionel-Groulx and Pie-IX.
The Orange line is down between Bonaventure and Beaubien.
The entire Yellow line is not operational.
Given the extent of the shutdown, the intervention by emergency services is probably at Berri-UQAM.
The STM is also tweeting about the incident.
Shutdown ORANGE line between Bonaventure and Beaubien. Inter. emergency services. Service expected to resume at 13:45. #stminfo J
Shutdown GREEN line between L-Groulx and Pie-IX. Inter. emergency services. Service expected to resume at 13:45. #stminfo H
Shutdown YELLOW line between Longueuil and Berri-UQAM. Inter. emergency services. Service expected to resume at 13:45. #stminfo A
The STM projects that service will resume at 1:45 PM.
UPDATE 1:45 PM: service is gradually resuming on all three lines. There are no updates as to the reason for the emergency intervention.
Stay tuned for updates on this developing story.