The News Agency of Nigeria (NAN) reports that hoodlums suspected to be members of the National Union Road Transport Workers (NURTW) invaded the Skypower Ground Ikeja venue with guns, daggers and other dangerous weapons, engaging one another in a bloody factional fight.
The situation sent panic across the campaign ground as party members ran in different directions to avoid being hit by bullets being fired indiscriminately by the hoodlums.
Security operatives had a hectic time controlling the situation.
Gov. Akinwunmi Ambode, who was making a speech, had to leave the stage immediately and was guarded out of the venue together with his deputy, Mrs Idiat Adebule, the APC governorship candidate, Mr Babajide Sanwoolu, and other prominent members of the party.
Several people were injured in the violence, including two journalists who sustained minor bullet wounds.
NAN correspondent who was at the venue could not ascertain if there was any loss of life at the time of filing this report.
In the ensuing confusion, many people were dispossessed of their phones, money and other valuables by opportunistic pick-pockets and other criminals.
NAN reports that a large number of party faithful were seen trekking to their various homes as there was a heavy vehicular traffic in the area because of the violence.