NASA leader Raila Odingas car was on Friday hit and a windscreen shuttered after police shot at the car.
Odinga was in the white Range Rover when the windscreen was hit in circumstances that are not yet clear.
Raila Odinga Junior, who was in the car with his father, stated that the car was hit by a teargas cannister, adding that live ammunition was also used against the armoured car.
Other reports indicated that the shattered screen was as a result of a live bullet.
"His vehichle was hit by a teargas canister along Jogoo road but we managed to move with the convoy and we are now at Bus Station,” Junior was quoted by news site, Kenyans.co.ke.
During the match, at least 3 people were shot and a police lorry burnt as NASA supporters engaged in running battles with the security officers.
More details to follow.