Officers of the Nigeria Police and operatives of the Department of State Services sent to provide security for Independent National Electoral Commission (INEC) collation centre in Kano clashed over the right to screen persons entering the venue.
It was gathered that the altercation began when security officials asked everyone in the hall to leave and present themselves for fresh screening.
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The policemen who has earlier controlled access into the centre were shoved aside by a team of heavily armed DSS operatives who were reportedly drafted in from Abuja.
An argument between a policeman and one of the DSS operatives over the right of passage degenerated into a shouting match which almost turned ugly until a senior plainclothes security officer intervened.