An intervention by the fire department is currently ongoing in the Plateau. Police have tweeted out saying that St-Laurent Boulevard is closed between Duluth and Napoléon. Napoléon is closed between Saint-Laurent and Sainte-Dominique.

The intervention has been ongoing for at least three hours now. At this time, we know that the intervention is due to the presence of "dangerous materials."

READ ALSO: Concordia University LB Building Evacuated And Closed (Video)

TL;DR An intervention by the Montreal Fire Department due to the presence of a suspicious package and potentially "dangerous materials" is currently ongoing. At this time, police are warning people to avoid the area.

Update: The SPVM have just tweeted to announce that the intervention is over:

The intervention is over, the area is reopened to the traffic. ^RM https://t.co/Dnqk4YdjmB

April 1, 2019

Sécurité Incendie Montréal tweeted out this at 11:00 a.m.

Intervention du groupe d’intervention en matières dangereuses en cours – Saint-Laurent/Duluth - Merci d’éviter le secteur. pic.twitter.com/chLUw9ghBU

April 1, 2019

The tweet states that an intervention in dangerous materials is currently underway. Police were alerted of a package containing an unidentified substance at around 1:30 p.m.

As of a few minutes ago, the intervention was still ongoing, as the SPVM retweeted the warning.

The police warned people to continue avoiding the area.

Ongoing intervention, avoid the area :
- Saint-Laurent is closed between Napoléon and Duluth.
- Napoléon is closed between Saint-Laurent and Sainte-Dominique.#SPVM #MtlCircul https://t.co/b3XjRi8SyK

April 1, 2019

 According to ICI Grand Montréal, the package may contain white powder.

[Dernière heure] La découverte d'un colis suspect force l'évacuation d'un immeuble sur le boulevard Saint-Laurent près des rues Duluth et Napoléon. Un large périmètre de sécurité est mis en place. pic.twitter.com/C77VMmfCyx

April 1, 2019

The building in question was evacuated after the discovery of the package. According to the chief of operations for the fire department, no one was injured or incapacitated by the substance.

Police, firemen and people in hazmats suit are all on the scene right now. We will update this post as more information becomes available.