File photo: A resident displays used bullet cartridges after an attack in Kilelengwani village in Tana River Delta in Kenya's coastal region.

Nairobi, Kenya -

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 on 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 2013's general elections, according to the UN.

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. - Sapa-AP