Residents who had congregated at the grounds, however, can be seen running for cover in a video as smoke billows from the podium.
The meeting became chaotic when the throng that had assembled at the Stadium was forced to run for cover.
According to preliminary police investigations, the supporters of Kisii Governor James Ongwae, who had earlier fought with those of Dagoretti North MP Simba Arati, may have been the ones who fired the tear gas.
In August, Arati will run for governor of Kisii County.
