Russian cybercriminals managed to hack into a Quebec municipality’s water treatment plant systems and had the ability to wreak havoc on the crucial infrastructure before getting caught, according to Canada’s cyber spy agency.

In one particular case discussed in the report, the signals intelligence agency said it was advised last October that Russian hacktivist group NoName had broken into the Quebec water plant’s network and gained access to many crucial systems.

According to CSE, NoName claimed it had gained the “ability to covertly control pumps, chlorine dosing, pressure settings and monitoring/alerts systems.” The report does not identify the impacted Quebec municipality.