Carlos Ghosn’s detention for almost 130 days in a Japanese jail was neither necessary nor reasonable and violated the former Nissan Motor Co. chairman’s human rights, a UN panel concluded in a harsh critique of Tokyo prosecutors who led the case against him.

The decision to arrest Ghosn four times in a row so as to extend his detention was “fundamentally unfair,” the UN Human Rights Council’s Working Group on Arbitrary Detention said in a report posted on its website. The panel said that it would refer the case to the UN’s rapporteur on torture, cruel and other inhuman or degrading treatment