Up to four people are reported to have been killed and many others injured. A number of shops were set on fire, as well as a hotel, a mosque and two churches. Police fired tear gas to try to end the riot, but a BBC correspondent in Nairobi says they were powerless in the face of large numbers of people armed with sticks, stones, knives and machetes.
Deal follows four year land crisis Links to more Africa stories are at the foot of the page.