MONTREAL — A company building a major factory for electric vehicle batteries in Quebec says incendiary devices were found Monday morning at its construction site east of Montreal, in what is the latest act of alleged vandalism against the project.

The devices consisted of bottles filled with flammable liquid with a “rudimentary” ignition system, said Paolo Cerruti, co-founder of Swedish manufacturer Northvolt. Cerruti, who is also CEO of Northvolt North America, told reporters the ignition system “allowed for a certain delay” before the bottles were supposed to catch fire, but “thank God it didn’t work.”