Two Jewish men were assaulted Saturday night outside a synagogue in Créteil, a Paris suburb.

According to Paris police, the two men, who are brothers, were attacked by two other men, one of whom fled on foot and the other on a bicycle.

The two men, who were reportedly beaten with brass knuckles, suffered multiple contusions and were hospitalized and listed in serious but not life-threatening condition.

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French Interior Minister Bernard Cazeneuve, who noted the victims were “of the Jewish faith,” condemned the attack with “utmost severity” on Sunday.

On Saturday night, hours after a deadly shooting at the Jewish Museum in Brussels which claimed four lives, including those of two Israeli tourists, Cazeneuve announced that he had instructed authorities to strengthen security at Jewish sites throughout France.

Cazeneuve pledged that French authorities would work to fight racism and anti-Semitism and said that police would do their best to apprehend the perpetrators.

The attack was condemned by French officials, including President François Hollande.