News24 reported that the herders from the Pokot Community opened fire at the Laikipia Nature Conservancy and killed the officers.
The officers were inside a pair of vehicles and part of a unit that works to prevent livestock thefts. The report says four other officers were wounded in the attack.
Hundreds of semi-nomadic herders invaded private ranches late last year to save their cattle from a prolonged drought.
The Laikipia Farmer Association says the herders now are camping on its members’ land and trying to take it over.