The criminals also reportedly attacked two police stations.
The police said the five officers suffered minor body injuries from gunshots fired by suspected al-Shabab militants who laid the ambush.
The senator was arrested alongside two former county officials linked to the scholarship scandal.
Footage by KTN News showed motorists scrambling to turn around on a teargas-drenched street in the port city of Mombasa as protesters fled on foot.
According to the Kenyan Red Cross, 32 individuals were hospitalised and blood donations were requested.
At least 47 people have died fasting over a promise that they would meet Jesus if they starved themselves to death.
Thousands took part in three marches over the past two weeks against high living costs and alleged fraud in last year’s vote.
Kenyan police fired tear gas and arrested several senior opposition politicians as hundreds protested against President William Ruto.
Kenyan police officers hunting car thieves had opened fire on the vehicle Arshad Sharif was travelling, claiming he drove through their roadblock without stopping.
“My Client – Mazi Nnamdi Kanu, was actually abducted by the accursed Kenya’s Special Police Force on the 18th of June 2021 at their International Airport.”
