The explosion at the school in ​an upscale residential neighbourhood on the ⁠south side of Amsterdam only caused ​limited damage, Mayor Femke Halsema said in ​a press release, as police and firefighters arrived at the scene quickly.

Security at ​synagogues and Jewish institutions in the ​Dutch capital had already been heightened after an overnight ‌arson ⁠attack at a synagogue in the centre of Rotterdam on Friday.

In neighbouring Belgium, an explosion caused a fire at a synagogue ​in Liege on ​Monday.

“This ⁠is a cowardly act of aggression against the Jewish community,” Halsema ​said.

“Jewish people in Amsterdam are ​increasingly ⁠confronted with antisemitism. This is unacceptable.”

Concerns about possible attacks against Jewish communities around the world ⁠have ​risen following US and ​Israeli attacks on Iran and a subsequent response from Tehran.