Authorities in Liège have condemned an early-morning explosion outside a synagogue as a serious act of anti-Semitism.

The blast occurred shortly before 4:00 a.m. on Monday outside the synagogue in the eastern Belgium city. No injuries were reported, but the explosion damaged windows in buildings opposite the place of worship.

Police quickly sealed off the area, closing the street and establishing a security perimeter while investigators examined the scene.

Liège Mayor Willy Demeyer strongly condemned the incident, describing it as an “extremely violent act of anti-Semitism.”

“The mayor and the city council express their total condemnation of this extremely violent act of anti-Semitism, which is contrary to Liège’s tradition of respect for others,” Demeyer said, according to Belga News Agency.

He also warned against importing international conflicts into the city, referring to the ongoing tensions involving Israel, the United States, and Iran.

Meanwhile, Yves Oschinsky described the explosion as “an extremely disturbing, serious and worrying anti-Semitic act.”