Several people, including old women and men have been arrested by the Sango Ota divisional police station in connection with the incident.
There was, however, a mild drama as policemen also arrested the cow and chairs bought for the carnival.
An eyewitness, who pleaded anonymity, said that the problem started on Friday night when Oruba youths organised a pre-carnival before the Saturday event.
Trouble started when a street urchin in the area, accused a 13-year-old boy of stepping on his feet.
The deceased, identified as Azeez, had hardly said a word when the urchin allegedly broke a bottle, stabbed him in the neck and ran away.
The incident brought a temporary halt to the carnival as the reveller tried to assist the injured boy who died on a bike on the way to the hospital.
Sunday Tribune gathered that the boy, who, last week, lost his younger brother, would have survived the injury but for the pieces of broken bottle that were lodged in his neck.
Policemen on Saturday morning invaded the carnival venue and arrested scores of people, including youths, women and others.
The policemen, however, created a scene when they untied the cow meant for the carnival and took it to Sango police station, as well as plastic chairs rented for the event.
A source at Sango police station confirmed the incident and added that “some” people had been arrested in connection with the incident.
The police source, however, denied that the cow was arrested, but admitted that it was taken away from Oruba in a patrol van to prevent further clash between youths in the area.
Efforts to get the reaction of the state police image maker , Muyiwa Adejobi, were futile as text messages sent to him were not answered just as calls were not returned.