Updated

A police official says 28 people have been killed in clashes between farmers and herders in south-eastern Kenya.

Anthony Kamitu, who is leading police operations to prevent the attacks, said Friday that the Pokomo tribe of farmers raided a village of the Orma herding community, called Kipao, at dawn in the Tana River Delta.

The latest deaths in a tit-for-tat cycle of killings may be related to a redrawing of political boundaries and next year's general elections, according to the U.N.

At least 110 people were killed in clashes between the Pokomo and Orma in September and October.

Animosity between the two communities over land and water resources has existed for decades.