As his country’s railway system comes under attack from anti-oil protesters, Canadian Prime Minister Justin Trudeau vowed to police the movement. The Calgary Herald reported in a story published Tuesday that a small group of activists have “shut down” the rail lines in Quebec, and Trudeau on Thursday assured Canadians he has little tolerance for threats to the railway.

Read more coverage of protesters who tried to derail trains carrying oil through Washington.

“We will take the necessary action to ensure this type of conduct does not happen again,” Trudeau said in Toronto. He is taking the risk of halting operations, while minimizing the damage to the Canadian economy.

According to The Calgary Herald, railway officials said the groups responsible for shutting down the lines will be charged as non-criminals, without being referred to the police as the law enforcement state would do. The actions have caused some delays, but the rail line remained open.

Trudeau did not say whether anti-oil activists would be arrested. However, he has promised that those involved will face “authority.”

The anti-oil protests have grown in recent weeks, in part because of the disaster at a train derailment in Quebec in 2013. The disaster claimed 47 lives.

The protesters are referring to the derailment as the Lac-Megantic disaster, because of the city’s name. The derailment is in Beloeil, just east of Montreal.