Inspector General of Police Japhet Koome said police arrested 238 protestors during the protests in Nairobi and Kisumu counties.
Among them was Azimio's Senate Minority Leader Stewart Madzayo and his National Assembly counterpart Opiyo Wandayi who were later released.
The DCI statement comes a day after Azimio leader Raila Odinga accused Deputy President RTigathi Gachagua of planning to cause chaos during next week's demonstrations.
Raila said he was privy to information that the DP, National Assembly Majority Leader Kimani Ichung'wah and Kiharu MP Ndindi Nyoro met on Tuesday evening to plan how to counter Azimio rallies.
Addressing the media at Capitol Hill in Nairobi on Thursday, the Azimio leader claimed that Gachagua and his allies were plotting to hire youths and have them dress up in outfits similar to those won by the Movement for Defence of Democracy, then cause mayhem.
"We are informing Kenyans that we have learnt of plans by Rigathi Gachagua, Kimani Ichung'wah and Ndindi Nyoro to sponsor youths to attack people during Azimio demonstrations so that they can portray our protests as violent, which is not part of our plans," said Raila.
He further alleged that Kenya Kwanza Alliance leaders' game plan is to cause a bloodbath using youths disguised as Azimio supporters - to have him taken to the International Criminal Court for war crimes.