Four people have been injured in a stabbing attack in downtown Frankfurt, Germany, a police spokesman told local FFH radio. The perpetrator is on the run, police added.

According to FFH the motive for the attack is so far unclear.

frankfurt attack
Police have confirmed the knife attack on their Twitter feed.

"There was a knife assault at the #Hauptwache in #Frankfurt. That's why so many colleagues [police officers] and rescue workers there," the message said.

frankfurt attack / twitter post
Law enforcers sealed off the area where the incident happened.

All of the four injured have been taken to various hospitals, but sustained no life-threatening wounds, Hessenschau reports.

The attack took place at the B-level of the Hauptwache train station in the very heart of Frankfurt am Main.

frankfurt attack / twitter post