Opposition leader Raila Odinga accused police officers of killing 15 National Super Alliance (NASA) supporters during Friday's processions following his arrival from the US.
Speaking during a presser at Okoa Kenya offices, Mr Odinga condemned the police stating the brutality meted on their supporters was unnecessary since the procession aimed at welcoming him from his trip overseas.
The opposition leader who had earlier on visited the City Mortuary lamented that he was saddened to witness how the lives of 15 young people were cut short.
“These needless brutalities and deaths yesterday show us all once again that this Jubilee regime opposes democratic choice as it cannot compete against the rest of us," Odinga stated.
“Not a single one of you will be forgotten. You did not die in vain. You sacrificed your lives for the cause of democracy as it gave you the freedom to choose your leaders and determine the direction of your country,” he added.
On Friday, the police claimed that five people died after they were stoned to death by enraged crowds.
They further disclosed that the deceased were victims of mob justice after attempting to loot during the chaos that marred parts of Nairobi County for the better part of the day.
In a statement, National Police Service spokesperson George Kinoti affirmed that the incidences happened around Ladhies and Racecourse roads and the area near the Country Bus station.
The drama started after police warned opposition supporters from accessing Jomo Kenyatta International Airport to receive the NASA leader.
Once Mr Odinga left the airport hundreds of his supporters were waiting outside and matched alongside his convoy for five hours braving teargas and water cannons.