Student groups plastered posters last week on the walls of a leading political science faculty in Grenoble that likened the professors to “fascists” and named them both in a campaign backed by the UNEF student union.

Junior interior minister Marlene Schiappa said the posters and social media comments recalled the online harassment of French schoolteacher Samuel Paty last October, who was beheaded in public after being denounced online for offending Muslims.

“These are really odious acts after what happened with the decapitation of Samuel Paty who was smeared in the same way on social networks,” she said on the BFM news channel. “We can’t put up with this type of thing.”

“When something is viewed as racist or discriminatory, there’s a hierarchy where you can report these types of issues, which will speak to the professor and take action if anything is proven,” Schiappa said.

Sciences Po university, which runs the Institute of Political Studies (IEP) in Grenoble in eastern France, also condemned the campaign on Monday and has filed a criminal complaint.

An investigation has been opened into slander and property damage after the posters saying “Fascists in our lecture halls. Islamophobia kills” were found on the walls of the faculty.

One of the professors is in charge of a course called “Islam and Muslims in contemporary France” while the other is a lecturer in German who has taught at the faculty for 25 years.