A 26-year-old Dortmund was critically injured in an attack with a knife on Tuesday in Dortmund.
According to the police, he was attacked and stabbed by three perpetrators in the Kirchlinde district.
On Wednesday there was no longer any mortal danger.
A 39-year-old from Dortmund was provisionally arrested.
According to Chief Public Prosecutor Carsten Dombert, the background to the attack is still open.