At least two people were killed on Wednesday in a shooting on a street in the German city of Halle, police said, adding that the perpetrators were on the run.
Police said they were looking for suspects who fled the scene.
A police tweet Wednesday gave no information on the nature of their deployment in the city but said that initial information is that "people were killed".
One suspect has been arrested, police said, though it was not immediately clear how many assailants were involved. The police have asked people in the area to stay in their home.More news: Boeing gets first 737 MAX order in months; deliveries halve
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The incident also comes on Yom Kippur, the holiest day in the Jewish calendar.
Police didn't give any further information, but said officers were out in force in the city hunting down the suspects.
Bild, a German daily, reported a gunman opened fire with an automatic weapon and lobbed a hand grenade into a nearby cemetery.
A video broadcast by a German television station appears to show a man in a helmet and an olive-colored top firing shots in the eastern city of Halle.