Almost Half The STM Orange Line Has Been Shut Down In Montreal Due To An Emergency Situation

The orange line has been shut down between Berri-UQAM and Henri-Bourassa, due to a medical emergency. Service is only estimated to pick up again at 12:35, which means that STM passengers will be stranded for at least an hour.
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TL;DR The Orange line is shut down between Berri-UQAM and Henri-Bourassa. Service is expected to resume by 12:35
The STM announced in a tweet that the orange line has been shut down due to a medical emergency.
Shutdown ORANGE line between Berri-UQAM and H-Bourassa. Inter. Emergency medical services. Service expected to resume at 12:35. #stminfo X
The STM's official wesbite also relates the shutdown, stating that the metro is only expected to reopen after midnight, but this is likely a typo.
In the meantime, a shuttle is running along the path of the shut down section of the orange line.
[Perturbation du service] 🚇⚠️ Un service spécial de bus a été demandé entre les stations Henri-Bourassa et Berri-UQAM. Suivez les indications du personnel STM sur place.
Service on the rest of the line may slow down as a result.
[Métro disruption] 🚇⚠️ Service disruption apply only on the segment of the métro line between Henri-Bourassa and Berri-UQAM. Depending on the number of métro trains on the affected segment, service on the rest of the line may experience slowdowns.
UPDATE: service is gradually resuming.
Service gradually resuming on the ORANGE line. #stminfo T
This is not the first major metro shutdown of the year. There have been numerous instances of metro closures, which have paralysed the sytem for several hours.
Last month, a faulty circuit breaker led to an explosion, which caused a fire underground. Due to this, the blue line was shut for most of the day.
We will update this post as more info becomes available.