Several people are dead and a police officer is among the injured after what is believed to have been a terror attack carried out by multiple suspects near a synagogue in Vienna.
The police officer who is seriously injured was shot, the APA news agency has said, citing Austria's interior ministry.
Austrian state broadcaster ORF has said the police have confirmed several people are dead.
The interior ministry also said one suspect has been arrested, APA added.
The Austrian news agency also quoted the country's interior ministry as saying that one attacker has been killed and another could be on the run.
Police have confirmed the gunfire and said several people are injured.
Oskar Deutsch, the head of the Jewish community in Vienna, said the shooting took place in the street where the city's main synagogue is located but that it wasn't clear whether the house of worship had been targeted.
Officers said the operation in the centre of the city was ongoing and urged people to avoid all open spaces and public transport.
Police tweeted: "There are several injured persons.
"We are on site with all available forces. Please avoid all public squares in the city."
Police added that the exact circumstances of the incident were still being determined.
State broadcaster ORF said the operation is taking place at a synagogue.
