Belgian Jewish activist Joel Rubinfeld said he received an online death threat for speaking about the Brussels Jewish museum killings.

On Monday, Rubinfeld published on the website of the League Against Anti-Semitism in Belgium, or LBCA — an organization he heads — the text of what he said constituted a threat.

“We absolutely need to shut Joël Rubintrickmachine’s fat mouth,” read the text, which was posted on the LBCA Facebook page. “His defamations, his grotesque generalizations make me want to commit murder.”

Rubinfeld said he would file a formal police complaint about the posting, which appears to have been spurred by his many media appearances following the slaying of four Jews on Saturday at the Jewish Museum of Belgium in central Brussels. Rubinfeld has called on Belgian authorities to take a firmer stance against minor and major incidents of anti-Semitism, referring to the French government as a role model.

Businessman and co-organizer of a European rally for Israel, Joel Rubinfeld, 33, attends the event in Brussels on May 29. (photo credit: Maryll Israel/JTA)

Businessman and co-organizer of a European rally for Israel, Joel Rubinfeld, 33, attends the event in Brussels on May 29. (photo credit: Maryll Israel/JTA)

“This guy is a notorious extremist, pro-Zionist who is simply an ignominy for Belgium for allowing him to express himself in such a manner,” the Facebook user added. “Nonetheless, I offer my condolences to the families for this heinous act.”

On Saturday afternoon, two individuals pulled up in an Audi car in front of Brussels’ Jewish museum. One man entered the building and killed four people, according to reports.

In the immediate aftermath of the attack on Saturday, Rubinfeld told AFP that the attack clearly “is a terrorist act” as a man had been seen driving up and entering the museum before opening fire inside and running off. He added that the act was the result of a “climate of hate.”

Belgium sent the file Monday to the federal prosecutor charged with handling cases of terrorism.

AFP contributed to this report.