BERLIN (AP) — A man was assaulted and wounded near a synagogue in Hamburg on Sunday, police said. The suspected assailant was arrested.

The 26-year-old victim, who was apparently about to enter the synagogue grounds, was hit in the head with what appeared to be a folding spade, police said. The suspect, a 29-year-old German man, was wearing military-style clothing.

The victim was given first aid at the scene by passers-by, then taken to a hospital with injuries that were described as “significant” but not life-threatening.

Officers who were on hand to protect the synagogue arrested the suspect, a police statement said. It added that the background to the assault is under investigation.

The incident comes amid heightened concern in Germany over anti-Semitism.

Nearly a year ago, a heavily armed white supremacist targeted a synagogue in the eastern German city of Halle on Yom Kippur, the holiest day in Judaism. He killed a passer-by and a man at a nearby kebab stall after failing to force his way into the building.

Security has since been increased at Jewish institutions across the country.