The 29-year-old was wearing a top with the Israel Defence Forces (IDF) logo when the attackers started harassing him on Friday about his religion, the police added, calling it “an anti-Semitic attack”.
Officers are seeking the assailants, who fled immediately after the attack, on suspicion of a politically-motivated crime.
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Saturday is the second anniversary of an attack by a far-right gunman on a synagogue in the eastern German city of Halle, who killed two in a rampage when he failed to break into the house of worship.
It was one of a string of incidents that led authorities to declare the far right and neo-Nazis Germany’s top security threat.
Also this week, a musician claimed he was turned away from a hotel in eastern city Leipzig for wearing a Star-of-David pendant.
While the allegations prompted a fierce response from a Jewish community unsettled by increasing anti-Semitic crimes, several investigations have been mounted into contradictory accounts of the incident.
In 2019, police recorded 2,032 anti-Semitic crimes, an increase of 13 percent year-on-year.
“The threat is complex and comes from different directions” from jihadists to the far right, the federal government’s commissioner for the fight against anti-Semitism Felix Klein said recently.