An official says armed raiders killed four people in Kenya's southeast despite a dusk-to-dawn curfew to prevent further clashes between two tribes that have left more than 100 people dead.

Hassan Musa, who led the Kenya Red Cross response to the affected village, says more than 150 heavily armed raiders from the Orma tribe of semi-nomadic livestock herders invaded a village of farmers from the Pokomo tribe Tuesday morning and burnt more than 100 houses. Pokomo raiders had killed 38 people from the Orma tribe on Monday.

The U.N. and Red Cross says on the surface the feud between the two communities appears to be over land and water resources but the redrawing of political boundaries and next year's general elections could be the cause.