Austrian authorities said on Tuesday that a man who was a victim of the attack by gunmen in Vienna's city centre on Monday evening died due to his injuries.
With this the number of fatalities in the deadly attack has now gone up to four. These include two men and two women.
The authorities said that a suspected attacker, who was carrying an assault rifle and a fake suicide vest, was also shot and killed by police.
However, the authorities are still trying to determine whether more attackers were involved and if yes how many of them were still at large.
They urged the people in Vienna to stay at home and not send the children to school.
The condition of seven of the victims is said to be critical and life-threatening, Austrian news agency APA reported, citing a Health Association spokeswoman.
A total of 17 victims are being treated at several hospitals, mainly for gunshot wounds and cuts. The 10 patients with minor injuries are in shock, she added.
The shooting began shortly after 8pm local time (19:00 GMT) on Monday near Vienna’s main synagogue as many people were enjoying the last night of open restaurants and bars before the start of a coronavirus lockdown.