Police said on Twitter earlier they were looking for at least one suspect.
Several shots were fired and the suspects then fled in a vehicle, police said in a tweet. They gave no information on that person.
The Bild and Middeldeutsche Zeitung newspapers reported that there was a shooting. Multiple people, according to the police department, were killed in the shooting. "We remain alert, however".
One person is believed to have been arrested. "Please stay at home or look for another secure place".
Jews around the world were marking Yom Kippur on Wednesday, the day of atonement, and the holiest day on the Jewish calendar.
Blizzard ban pro Hearthstone player over support of Hong Kong protests
I hope my act can inspire other gamers like me, to continue to support the movement in Hong Kong'. Another wrote: 'I had been supporting the Blizzard Entertainment for almost 20 years.
Company planning to pull together Apple Music, Arcade, News
However, there is a catch - a catch 22 - if you drop the Apple subscription, you lose every piece of music you have acquired. We don't know whether this bundle would include other services like News+, Arcade, AppleCare+, or iCloud storage.
Swiss scientists win Nobel Prize in Physics
The Nobel Prize, first awarded in 1901, is widely considered the highest honor in science , economics, and literature. Swedish TV4 asked, "It's been 14 billion years since our Universe was created".
Other witnesses told Mitteldeutsche Zeitung that the attack unfolded right outside a kebab shop and that some shots were fired from inside a auto.
"Our forces have detained one person", a tweet from the police said.
Police said that shots were also fired in Landsberg, about 15 miles (just under 10 miles) from Halle. "We have deployed forces in and around Halle and are trying to stabilise the situation until we have all the relevant information".
National rail operator Deutsche Bahn said the main trainstation in Halle had been closed.