At least two people were killed Wednesday in a shooting on a street in the German city of Halle, police said.
The central train station was closed while the area was under lockdown, rail company Deutsche Bahn said.
German police said they have captured one suspect in a shooting left two dead in Halle, but urged residents to remain vigilant.
"Our forces have arrested one person. Stay watchful nevertheless," police wrote on Twitter.
According to Bild daily, the shooting took place in front of a synagogue in the Paulus district, and a hand grenade was also flung into a Jewish cemetery. Police could not be reached immediately for confirmation.