Vienna police confirmed on Monday that the shooting took place "in the Inner City district" and added that "there are persons injured" without, however, providing additional details.
Police called on people to "KEEP AWAY from all public places or public Transport".
According to Austrian newspaper Kurier, an armed police officer was seriously wounded during the shooting, as the criminal fled the scene and remains at large. The OE24 broadcaster reported that about 50 shots were fired in the street near the synagogue, adding that the shooting was carried out with the use of a machine gun.
Kronen Zeitung reported that a man who attacked the synagogue in the center of Vienna may have committed suicide, but accomplices could still be at large.
Follow Sputnik's live feed to find out more.