The home of the attacker shot dead by police has been searched and video material seized.
Two men and a woman have died in a terror attack in Vienna and 15 others have been wounded – some seriously, including a police officer.
One suspect, who was armed with an assault rifle and wearing a fake suicide vest, was shot dead by police. It is thought at least one other attacker may still be at large.
Austria’s interior minister Karl Nehammer described the suspect as an IS sympathiser and said the operation to track down any other suspects was ongoing.
He added that special forces from neighbouring countries were helping in the operation and that the home of the suspect killed by police had been searched and video material had been seized.
The APA news agency later reported that arrests had been made in connection with the attack following further raids.
“We experienced an attack yesterday evening from at least one Islamist terrorist,” Mr Nehammer told a news conference.
He urged the city’s residents to stay at home.
The first gunshots heard at 8pm local time at the Seitenstettengasse synagogue.
The 15 people who were hurt in the attack are in hospital, several of them seriously injured.
Rabbi Schlomo Hofmeister said he saw at least one person shoot at people sitting outside bars below his window.
Mr Hofmeister said: “They were shooting at least 100 rounds just outside our building.
Gunshots heard during ‘terror attack’ in Vienna
“All these bars have tables outside. This evening is the last evening before the lockdown,” he added.
“As of midnight, all bars and restaurants will be closed in Austria for the next month, and a lot of people probably wanted to use that evening to be able to go out.”
Eveline, a witness and student, said: “First we did not know what it was, but suddenly people, who were sitting in other guests’ gardens, started to run.
“First we kept standing there because we did not know what was going on, then there was shooting again, but closer, so we started to run away. Because we did not know if we were running in the right direction, we ran into a hotel and hid there.”
Austrian Chancellor Sebastian Kurz said: “I am glad that our police were able to neutralise one of the attackers.
“We will not never allow ourselves to be intimidated by terrorism and will fight these attacks with all means.”
Mr Kurz said these were “difficult hours for our republic” and vowed: “Our police will act decisively against the culprits of this despicable terror attack.”
French President Emmanuel Macron tweeted that the French “share the shock and grief of the Austrian people hit by an attack tonight”.
‘Multiple attackers’ in Vienna shootings
He wrote: “After France, this is a friendly country that has been attacked. This is our Europe… We will not give in.”
France has endured three attacks blamed on Muslim extremists in recent weeks.
Local media in Austria reported earlier that a synagogue had been attacked and shots fired in the area of a nearby square, Schwedenplatz, while there were unconfirmed reports of coordinated attacks nearby.
Oskar Deutsch, the head of the Jewish community in Vienna, said shootings took place in the street where the city’s main synagogue is located – but that it was not clear whether the house of worship had been targeted.
Mr Deutsch tweeted that the synagogue was closed at the time of the shootings
Officers said the operation in the city centre was ongoing and urged people to avoid open spaces and public transport, and footage posted online showed crowds fleeing.
In other videos uploaded to social media, armed officers were seen patrolling the streets and gunfire could be heard in one clip recorded from a window above a McDonald’s restaurant.
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