Austrian police said at least 3 people were injured in a knife attack Wednesday on the streets of Vienna, with the attacker possibly injuring a fourth nearby.

Vienna police said the attack happened at about 7:45 p.m. (1845 GMT; 1 p.m. EST) on Praterstrasse in Vienna’s Second District, which includes the famous Prater park as well as the Praterstern transport hub. It also houses much of Vienna’s small 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,” a Police spokesman said.

“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.

The other knife attack, shortly afterwards in the same area, seriously wounded a 20-year-old Chechen. A male with Afghan nationality was arrested at the scene.

Witness Silvia Franke said she was about 100 meters (330 feet) away when the incident happened.

“I saw how someone in the middle of the street was screaming and shouting — I thought he was beating his dog judging from his hand movements,” she said. “And in reality he was stabbing this man.”

“He could have stabbed me as well had I been there by chance,” Franke said. “He had lost all control.”

(AP)