Supporters of Governor Hassan Joho caused chaos in the final rally of NASA in Mombasa County after they blocked a group supporting Hassan Omar from accessing the dias.
Both supporters used pepper spray throwing the whole forum into a limbo as other NASA supporters scampered for safety.
Police officers were forced to intervene and restore order with both factions of the group trying to attack each other.
NASA will on Saturday hold their final rally in Uhuru Park, Nairobi County.
NASA Presidential candidate Raila Odinga has exuded confidence that he will trounce President Uhuru Kenyatta in next week's polls.
Senator Omar is seeking the Mombasa gubernatorial seat on a Wiper ticked while Joho on ODM.
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