A gunman was killed, and the authorities were searching for possible accomplices, but the police suggested that the attacker had acted alone.

Vienna Shooting Live Updates: 4 Dead in Terror Attack by ‘ISIS Sympathizer’

Vienna Shooting Live Updates: 4 Dead in Terror Attack by ‘ISIS Sympathizer’

Vienna Shooting Live Updates: 4 Dead in Terror Attack by ‘ISIS Sympathizer’

Vienna Shooting Live Updates: 4 Dead in Terror Attack by ‘ISIS Sympathizer’

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An official says the gunman was a 20-year-old from Vienna who was known to the intelligence services.

Here’s what you need to know:

    Vienna confronts a night of fear, and Austria announces days of national mourning.What do we know about the gunman who was killed by the police?The view from Vienna, a bustling capital gone quiet.With the target unclear, the authorities discouraged speculation.The city has found itself in the cross hairs before.

Vienna confronts a night of fear, and Austria announces days of national mourning.

Vienna Shooting Live Updates: 4 Dead in Terror Attack by ‘ISIS Sympathizer’

Investigators on Tuesday at the scene of the attack in Vienna the night before.Credit…Ronald Zak/Associated Press

Austria was grappling on Tuesday with a brutal attack in which a gunman, whom officials described as an ISIS sympathizer and who was wearing a fake explosive device, opened fire on Monday night in the heart of Vienna, the capital, killing at least four people.

By Tuesday morning, around 1,000 police officers had fanned out across the city to patrol the streets. Leaders addressed the nation, and an anxious public, largely confined to their homes amid a new coronavirus lockdown, waited for answers.

But some details about the violence the night before, and its perpetrator, remained unclear.

Chancellor Sebastian Kurz said in an address to the nation on Tuesday morning that the shooting was “definitely an Islamist terrorist attack,” which he called “an attack out of hatred, hatred for our basic values.”

“We often see ourselves as a blessed island where violence and terror is only known from abroad,” he said. “But the sad truth is: Even if we live in a generally safe country, we don’t live in a safe world.”

The police killed a gunman, whom Interior Minister Karl Nehammer described as an Islamic State “sympathizer” at a news conference on Tuesday morning.

The police appeared to suggest that the man had acted alone, though the authorities had previously said that there were multiple attackers.

Austria’s government announced a three-day official mourning period beginning on Tuesday, in which flags on public buildings will be lowered to half-staff. A minute’s silence was held at noon.

On Tuesday morning, Harald Sörös, an Interior Ministry spokesman, said that a second woman had died of her injuries, bringing the number of victims to four. Fourteen people were wounded, six of them seriously, he said.

Monday’s violence comes after a recent terror attacks in France — including the beheading of a teacher and a knife attack at a church — that have both been linked to Islamist extremists. But Mr. Kurz warned against making assumptions about the Muslim community.

“This is no fight between Christians and Muslims, or between Austrians and migrants,” he said. “This is a fight between civilization and barbarism.”

Ümit Vural, president of the Islamic Faith Community in Austria, condemned the “cowardly, revolting attack,” calling it “an attack on our Vienna” and “an attack on all of us.”

“Our democracy, our freedom and liberal order is stronger than violence and terror,” he said.

What do we know about the gunman who was killed by the police?

Interior Minister Karl Nehammer, left, and Chancellor Sebastian Kurz during a video conference on Tuesday.Credit…Helmut Fohringer/Agence France-Presse,

A senior official confirmed that the attacker who was killed was a 20-year-old Vienna-born man whose parents came from North Macedonia. The Austrian intelligence service was apparently aware of him because he was one of about 90 Austrians who had planned to join the Islamic State in Syria, and he was blocked from traveling to the region.

He was sentenced last year to 22 months in prison because of his attempt to travel to Syria and join the extremist group.

On Tuesday morning, Karl Nehammer, the interior minister, described the gunman as an Islamic State “sympathizer” but did not reveal the man’s name. He said the police had searched his apartment.

Mr. Kurz said in his speech Tuesday morning that the gunman had killed four people at close range — an older man, an older woman, a younger man passing by and a waitress working in a restaurant.

But he also urged citizens to remember that “our enemy is never all those belonging to a religion, our enemy is never all the people that come from a particular country” but rather that “our enemy is extremists and terrorists.”

“They do not belong in our society,” he added.

The view from Vienna, a bustling capital gone quiet.

Police officers in the city center on Tuesday. The attack on Monday came hours before Austria entered a coronavirus lockdown, with many people having gathered outdoors before it came into force. Credit…Thomas Kronsteiner/Getty Images

The cobbled streets of the center of Vienna, normally full of tourists, government employees and other citizens, was largely empty on Tuesday, save for hundreds of heavily armed police officers. School attendance was optional and residents were encouraged to stay home.

Church bells rang out at noon, as the city paused for a moment to honor the victims.

The attack on Monday came hours before the country entered a lockdown to combat the coronavirus, with many people having gathered outdoors in Vienna before it came into force. Hundreds of others were trapped in the city’s famed opera house and the national theater, both of which were evacuated by the police hours after the curtains had fallen.

“You could feel a lot of people wanted to get out one more time before lockdown starts,” said Ameli Pietsch, 23, who was in the area an hour before the attack. “It was a mild evening, and lots of people were outside.”

All of that changed in a moment. People scrambled from the streets to shelter in restaurants, and all trams and subways in the city’s center were halted as the police urged residents to shelter in place.

The sound of sirens and helicopters filled the night air as people struggled to absorb what was happening.

Said Farnaz Alavi, 34, a human resources consultant in Vienna, said, “We are in shock.”

With the target unclear, the authorities discouraged speculation.

Officers in Vienna on Monday night. The police have urged people not to share any “rumors, accusations, speculations or unconfirmed numbers of victims.”Credit…Roland Schlager/Agence France-Presse

The area where shots were first reported is a tight web of streets packed with bars and pubs, known locally as the “Bermuda Triangle.” It is also home to Vienna’s main temple, the Seitenstettengasse synagogue. But the attack’s intended target, or targets, was unclear.

The president of the Jewish Religious Community in Austria, Oskar Deutsch, said on Twitter that the initial shooting had occurred “in the immediate vicinity” of the temple, but that it was closed at the time.

“It is not clear right now whether the main temple was the target,” he said. Jewish institutions across the city were closed on Tuesday, the Jewish Community of Vienna said on its website.

The police took to Twitter to urge restraint.

“Please don’t share any rumors, accusations, speculations or unconfirmed numbers of victims,” they said. “That does not help at all! Stay inside, take shelter. Keep away from public places.”

As news of the attack unfolded, several people posted dramatic videos on social media of what appeared to be the shooting and its aftermath.

One showed people helping a wounded person who was lying in a pool of blood, just outside a restaurant on Ruprechtsplatz and less than a mile from the Austrian Parliament. Several chairs in the restaurant’s outdoor area had been overturned, as if abandoned in a hurry.

Another video showed a man emerging from a bar or restaurant, then firing a rifle twice down a street. And a separate video appeared to show the same gunman on the same street, shooting a man with a long gun at close range, then returning seconds later to shoot him twice more.

The Vienna police, in a post on Twitter, pleaded with witnesses not to post videos and pictures to social media, but instead to send them to the authorities.

The city has found itself in the cross hairs before.

The aftermath of a 1985 attack at the airport in Vienna.Credit…Leopold Nekula/Sygma, via Getty Images

Austria — and Vienna in particular — has been a target over the years for terrorist attacks, often with deadly outcomes. Religious and political tensions, sometimes with no clear connection to Austria, have led to sporadic violence.

In 1975, a meeting of the Organization of the Petroleum Exporting Countries in the city was stormed by six men with submachine guns. They killed three people and took at least 60 hostages.

A group that claimed responsibility cast the attack as “an act of political contestation and information” aimed at “the alliance between American imperialism and the capitulating reactionary forces in the Arab homeland.”

In 1981, Heinz Nittel, a leader of the Austrian Socialist party and head of the Austria-Israel Friendship Society, was assassinated outside his home by an assailant associated with a militant Palestinian group.

Two people were killed in 1981 when terrorists attacked a synagogue with grenades and firearms. Just after Christmas in 1985, panic engulfed the Vienna airport when three gunmen stormed the check-in lounge and opened fire with submachine guns, killing three and wounding dozens.

Witnesses at the time said the attack began as an El Al Israel Airlines flight was boarding. The attack appeared to be coordinated with another El Al check-in 10 minutes earlier in Rome.

From 1993 to 1997, a series of mail bombs and other explosive devices, including one that wounded the mayor of Vienna, stoked fears of rising neo-Nazi terrorism in the country. The man who was convicted in the attacks said that his goal had been to create a reunification of German-speaking areas.

Melissa Eddy, Christopher F. Schuetze and Katrin Bennhold reported from Berlin, and Megan Specia from London. Reporting was contributed by Christoph Koettl, Farnaz Fassihi and Emmett Lindner from New York; Livia Albeck-Ripka from Darwin, Australia; and Joe Ritchie from Hong Kong.