At least four people were seriously injured Wednesday following two knife stabbing incidents in a central district of Vienna while a suspect in one of the two attacks was arrested but his motive remains unknown, according to Austrian police. At least one of the assailants, whose motives remain unknown, is still on the run.The first incident took place near the Austrian capital's famous Prater Park around 19:45 local time (18:45 GMT) when a man suddenlywith a folding knife in front of a Japanese restaurant on Praterstrasse. In the first attack, a man with a knife stabbed a couple and their daughter outside a restaurant, police said. The three people were seriously injured and their lives are in danger," a police spokesman told Reuters.The assailant was shouting at his victims before stabbing them, witnesses to the attack recalled Silvia Franke told Austria's Kurier newspaper.After stabbing the Austrian family, the perpetrator immediately fled the scene of the crime, shouting at and threatening people along his way.Authorities deployed a number of ambulances and a Special Forces unit to track the suspect. “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," Maierhofer went on to say.A manhunt was launched, with both police and Vienna's tactical police unit WEGA deployed to the scene and surrounding area. We know we are looking for a man.”

A male citizen of Afghanistan was later arrested in connection with the second assault, but no further details were immediately available and any connection between the stabbings remained unclear, the spokesman said shortly afterward.
Two connected stabbings occurred in Vienna, Austria: three people were seriously injured outside a Japanese restaurant, and one man in a later stabbing. The perpetrator was arrested.