Two separate knife attacks in Vienna have left four people seriously injured and a state of fear gripped the entire city after the incident.

According to the details provided, four people got seriously injured as a result of the attacks which took place in different parts of Vienna, the capital of Austria, on Wednesday evening.

The first stabbing took place at 7:45 pm and it occurred in Vienna’s Second District, which includes the famous Prater Park as well as the Praterstern transport hub. The area houses much of Vienna’s Jewish community.

“A man attacked a family — a father, a mother and their 17-year-old daughter — with a knife. The three people were seriously injured and their lives are in danger,” the spokesman said, adding later that they were Austrian citizens.

“And half an hour later, there was another attack … at Praterstern and here a person was also seriously injured and their life is in danger. We do not know to what extent there is a connection here and any motive remains unclear,” he said.

Asked what was known about an assailant, he added: “Absolutely nothing. We know we are looking for a man.”

So far it is also not clear whether there is a connection between the assaults. It has been reported that a male citizen of Afghanistan was later arrested in connection with the second assault but so far there are no other details provided.

Till the incident, Austria had remained safe from deadly extremist attacks like the ones experienced by Paris, Berlin and Brussels since 2015.