Interior Minister Karl Nehammer said video material offered no evidence of another attacker though it isn't the final word.
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A 20-year-old Austrian-North Macedonian dual citizen, who was shot and killed by police minutes after the attack started on Monday evening, has been identified as the assailant in what authorities say was an Islamic extremist attack. Four people died in the shooting.
Nehammer said that the number of wounded has risen to 22. And he said that 14 people associated with the assailant have been detained for questioning in searches on 18 properties in and near Vienna.
This is a breaking news update. A previous version of this report is below.
At least one Islamic extremist - a 20-year-old armed with an automatic rifle and a fake explosive vest - rampaged through a crowded Vienna nightlife district hours ahead of a coronavirus lockdown, leaving four people dead before he was killed by police, Austrian authorities said Tuesday.
The suspect in Monday night's attack was identified as a young Austrian-North Macedonian dual citizen with a previous terror conviction for attempting to join the Islamic State extremist group in Syria.
Unverified video showed the suspect, dressed in white coveralls, firing off bursts apparently at random as he ran down the Austrian capital's cobblestone streets.
Police have arrested several other people and searched 15 houses and apartments, Interior Minister Karl Nehammer told the Austrian news agency APA.
Two men and two women died from their injuries in the attack, Chancellor Sebastian Kurz said. He said a police officer who tried to get in the way of the attacker was shot and wounded, and another 14 people were hurt.
Vienna's hospital service said seven people were in life-threatening condition Tuesday after the attack, APA reported.
"Yesterday's attack was clearly an Islamist terror attack," Kurz said. "It was an attack out of hatred - hatred for our fundamental values, hatred for our way of life, hatred for our democracy in which all people have equal rights and dignity."
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The attacker, identified as Kujtim Fejzulai, was sentenced to 22 months in prison in April 2019 because he had tried to travel to Syria to join the Islamic State group. He was granted early release in December under juvenile law.
Nehammer told APA that Fejzulai had posted a photo on his Instagram account before the attack that showed him with two of the weapons he apparently used.
"(The suspect) was equipped with a fake explosive vest and an automatic rifle, a handgun and a machete to carry out this repugnant attack on innocent citizens," Nehammer said.
Authorities were still trying to determine whether further attackers may be on the run. People in Vienna were urged to stay at home if possible on Tuesday and children did not have to go to school. Some 1,000 police officers were on duty in the city on Tuesday morning.
The shooting began shortly after 8 p.m. (1900 GMT) Monday near Vienna's main synagogue as many people were enjoying a last night of open restaurants and bars before a month-long coronavirus lockdown, which started at midnight.
Vienna police chief Gerhard Puerstl said the attacker was killed at 8:09 p.m. But authorities continued to look for potential further assailants.
"We will unearth and chase down the perpetrators, those behind them and like-minded people and give them the punishment they deserve," Kurz said. "We will pursue all those who have anything to do with this outrage by all available means."
His government on Tuesday ordered three days of official mourning, with flags on public buildings to be flown at half-staff until Thursday.
Austria held a minute of silence at midday Tuesday, accompanied by the tolling of bells in the capital. Kurz, President Alexander Van der Bellen and other leading politicians laid wreaths and candles where the attack took place.
Alois Schroll, an Austrian lawmaker and the mayor of the town of Ybbs, said he had just arrived at a nearby restaurant when the attack started. He said he "saw many, many people running with their hands up high, they were in a panic and screaming."
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Police "sealed off the entire restaurant," Schroll, 52, told The Associated Press. "People started getting phone calls ... so finally we understood what was going on."
"People inside the restaurant were in shock, there were several women who were crying. And it wasn't until shortly before 1 a.m., that police finally let us out of the restaurant."
Schroll said he wasn't allowed back to his apartment because the area was still blocked off - "instead, we had to go across a bridge, also with our hands raised up. We couldn't find a hotel, so we were just wandering around for hours."
Fejzulai's lawyer in the 2019 case, Nikolaus Rast, told public broadcaster ORF that his client had seemed "completely harmless" at the time.
"He was a young man who was searching for his place in society, who apparently went to the wrong mosque, ended up in the wrong circles," Rast said. "I can't say exactly what happened."
Fejzulai's family "wasn't strictly religious at all; the family wasn't radical - it was a completely normal family," Rast said. "I still remember that the family couldn't believe what had happened with their son."
The attack drew swift condemnation and assurances of support from leaders around Europe, including from French President Emmanuel Macron, whose country has experienced three Islamist attacks in recent weeks, and German Chancellor Angela Merkel.
U.S. President Donald Trump tweeted Monday night as he prepared for his final rally ahead of Election Day: "Our prayers are with the people of Vienna after yet another vile act of terrorism in Europe."
"These evil attacks against innocent people must stop," Trump added. "The U.S. stands with Austria, France, and all of Europe in the fight against terrorists, including radical Islamic terrorists."
Egypt's Al-Azhar, the Sunni Muslim world's foremost religious institution, condemned the "terrorist attacks" in Vienna. It called on international institutions "to stand united" against terrorism and reject violence and hatred.