A young Belgian man badly hurt in an attack on the Jewish Museum in Brussels died of his injuries on Friday, the public prosecutor’s office said.

The Belgian, who was in his early 20s, is the fourth fatality from the May 24 shooting. An Israeli Jewish couple and a French woman were killed immediately by the gunman who perpetrated the attack.

The attack is suspected to be the work of a 29-year-old Frenchman, Mehdi Nemmouche, who has spent more than a year fighting with radical jihadists in Syria and who was detained days after the shooting.

It was the first such attack in Brussels in three decades, raising fears across Europe of a resurgence of anti-Semitic violence and of terror attacks from foreign fighters returning from Syria.

Nemmouche is being held in detention in France and has opposed extradition to Belgium.

Leaders of the G7 industrialised nations this week agreed to work together to tighten defences against the risk of attacks by European jihadists returning from Syria.