The protesters give President Muhammadu Buhari 24 hours to announce immediate prosciption of the embattled police unit.
A state high court judge says David West must die by hanging for a series of killings he committed in Port Harcourt.
The police corporal was lynched after officers opened fire into a procession in Ughelli, severely wounding a teenager.
The unit has been blamed for killing, maiming, robbing and blackmailing Nigerian youth across different parts of the country.
Both camps are now set for showdown on October 10.
The suspects were arrested based on the victim’s petition to the anti-graft office.
The PDP and ZLP have been exploring a possible alliance to avert APC victory on October 10.
The union is protesting about the payment of a national minimum wage and the use of a government payroll scheme.
The police promise effective coordination and implementation of security towards the exercise on October 10.
The violence came days after the police warned against October 1 protests by residents, especially members of the separatist Indigenous Peoples of Biafra.
