Three General Service Unit (GSU) police officers died on the spot following a grisly accident on Kabarnet-Iten road, Tuesday.
Three others officers sustained serious injuries after their vehicle veered off the road and rolled several times.
Baringo county commissioner Peter Okwanyo said the injured officers were rushed to Kabarnet County Referral Hospital.
"They were later referred to Moi Teaching and Referral Hospital in Eldoret," Okwanyo told the Star.
He said the officers were heading to Tot, Elgeyo/Marakwet from Marigat at the time of the accident.
"The driver lost control of the car as he negotiated corners in Kaptimbor area near Rimoi game reserve," he said.
The officers had been deployed to Kerio Valley to fight bandits from Baringo and Elgeyo/Marakwet counties.
Eye witnesses said the police vehicle was speeding before it crashed.