The festival's organiser has promised it will be "the safest place in Germany".
The stabbings, along with the claim of responsibility from ISIS, have sparked concern among some politicians who have urged enhanced security, tighter curbs on weapons, stiffer...
The Bild and Spiegel news websites reported that the suspect had given himself up after the incident on Friday night which also left eight people wounded.
The group said in a statement published on its Amaq news site that the attacker targeted Christians, 'to avenge Muslims in Palestine and everywhere.'