Two people have been killed and another two injured in shootings in the east German city of Halle.
The first shooting took place outside a synagogue before an area near a kebab shop was targeted. It is unclear at which locations the victims were killed.
One of the suspected gunmen posted head-cam footage of one the attacks on a gaming website. Sky News has chosen not to show the footage.
According to reports, the first attack targeted a synagogue where up to 80 worshippers were marking Yom Kippur, the holiest day of the Jewish calendar.
Max Privorozki, Halle's Jewish community chairman, described how a gunman tried to shoot his way into the building.
"We saw via the camera system at our synagogue that a heavily armed perpetrator with a steel helmet and a gun tried to shoot open our doors," he told the Stuttgarter Zeitung newspaper.
"The man looked like he was from the special forces... But our doors held.
"We barricaded the doors from inside and waited for the police."
The second assault was on a kebab shop in the Saxony area of the city.
Witness Conrad Roesler told n-tv television: "He had an assault rifle and a helmet and suddenly he threw what looked like a grenade.
"It bounced off a door frame... Suddenly he picked up the rifle and fired at the shop... I hid in the toilet."
A short time later, shooting was reported in the nearby town of Landsberg, where the mayor said gunmen had hijacked a car. There was also a large police presence reported in Wiesderdorf, another nearby town.
Police have arrested one suspect and have now told residents of Halle there is no longer an "acute" danger to the public.
German foreign minister Heiko Mass wrote on Twitter: "That on the Day of Atonement a synagogue was shot at hits us in the heart.
"We must all act against antisemitism in our country."
In Berlin, the state interior senator urged police to step up security at Jewish institutions in the German capital.