Several people have been injured and police officers are out in force after gunfire broke out in the Austrian capital of Vienna.
The shooting is believed to be a terrorist attack, Austria’s Interior Minister Karl Nehammer said on public broadcaster ORF.
Mr Nehammer said people had been injured and others were probably killed during the incident.
“At the moment I can confirm we believe this is an apparent terror attack,” he said.
Citing police, the public broadcaster also reported several people had been killed.
The source of the gunshots and extent of injuries was initially unclear but news agency Austria Presse Agentur reported the Austrian Interior Ministry as saying one attacker has been killed and another could be on the run.
It also reported a police officer had been shot.
The head of the Jewish community in Vienna, Oskar Deutsch, said the shooting took place in the street where the city’s main synagogue was located, but it was not clear whether it had been targeted.
Mr Deutsch said the synagogue was closed at the time of the shooting.
The Vienna police force said the operation in the centre of the city was ongoing and it urged people to avoid all open spaces and public transport.
“There are several injured persons,” police said on Twitter.
“We are on site with all available forces. Please avoid all public squares in the city.”
ORF reported witnesses as saying several shots were fired shortly after 8:00pm.
The police operation has been taking place in the centre of Vienna, close to the Danube River.
Vienna police also wrote on Twitter that the exact circumstances of the incident were still being determined.
They warned locals not to share videos or photos of the incident.
More to come.