The fire was reported around 6:20 a.m. local time Tuesday in the suburb of Anderlecht. Three people were injured as a result of smoke inhalation, Deutsche Welle reported.

Police investigators believe that the evidence points to an arson attack, but it is unclear if the incident was anti-Semitic. “All leaders are open,” a spokesman for the city prosecutor said.

The suspected arson came just days after the reopening of the Brussels Jewish Museum, which had been closed since four people were killed there on May 24 by a French-Algerian terrorist with ties to the Islamic State.

“The rapid increase in anti-Semitic acts in Belgium observed these last few months signal the urgency that there is in integrating this fight into the next governmental program,” Joel Rubinfeld, president of the Belgian League Against Anti-Semitism, said in a statement issued after the suspected arson.

“The fight against anti-Semitism is more than ever a real national cause. It is the honor and probably future of our country,” he said.