The STM has just sent out a tweet announcing that the 3 metro lines have been shut down!
The reason for the closure has not been announced, although they have said that the situation involves an intervention by emergency medical services.
UPDATE: Service has resumed on all three lines. The shut down was caused by a pepper spray attack.
TL;DR Three metro lines have been shut down in Montreal this morning.
Shutdown ORANGE line between Côte-Vertu and Montmorency. Inter. emergency services. Service expected to resume at 8:45. #stminfo R
Shutdown GREEN line between L-Groulx and Frontenac. Inter. emergency services. Service expected to resume at 8:45. #stminfo Z
Shutdown YELLOW line between Longueuil and Berri-UQAM. Inter. emergency services. Service expected to resume at 8:45. #stminfo F
The service disruption occurred around 8:15 am this morning and the STM was quick to update their site with the closure.
We will update the article when more info becomes available.