A knife-wielding man reportedly screamed “Allahu Akbar” during a wild attack inside a Hamburg supermarket that killed at least one person and left four others bloodied and wounded on Friday.

German police arrested the suspected attacker in the Barmbek district after witnesses followed the man and alerted authorities. The suspect was overwhelmed by passers-by and slightly injured in the process, police said.

The assailant entered the supermarket and stabbed one person, who died at the scene, before fleeing the scene. While on the run, the suspect stabbed and injured four other people, according to reports.

“He struck out at customers without warning. There are one dead and several injured,” Heike Uhde, a police spokeswoman said.