The traditional ruler was murdered at his palace on Feb. 27.
Police in Ebonyi on Sunday warned the feuding communities to sheath their swords or face the wrath of the law.
The arrested four suspects, all male, are Kelechi Nwali, Onyebuchi Chita, Aloke Obinna and Ifeanyi Nwokpuku.
Onome Onovwakpoyeya, the police public relations officer in Ebonyi, who confirmed the incident, said the electoral materials were initially destroyed.
The police command in the state is appealing for information from the general public on the whereabouts of the wanted persons.
The victim, Charles Nwankwo, was killed in his house in Ogboji Ward, Ezza North LGA of Ebonyi.
The victim was killed on Wednesday in his house in Ezza North Local Government Area of the state.
Attacks on INEC offices across the South-East have become commonplace of recent.
