Fighting has erupted in another town in western Kenya, say reports. Reports suggest at least nine people have been killed in brutal inter-tribal bloodshed in Naivasha. Gangs of youths blocked the main road. The town is about 60km (37 miles) south of Nakuru - also the scene of recent fighting - and sits on the main road between Nakuru and the capital Nairobi.
Former UN chief Kofi Annan has been holding talks to try to end the month-long election deadlock in Kenya.
He was meeting opposition leader Raila Odinga in Nairobi on Sunday. Mr Annan visited the violence-racked Rift Valley on Saturday, and later said he had seen tragic, heart-wrenching scenes, and "gross and systematic abuse of human rights".
Mr Odinga accuses his rival, President Mwai Kibaki, of stealing December's presidential election.
Unrest has left at least 750 people dead and about a quarter of a million homeless.
Hacked to death
The fighting in Naivasha is thought to have broken out late on Saturday, says the BBC's Adam Mynott in Nairobi.
Reports are confused but he says at least nine people are feared dead - hacked to death by mobs with machetes. Vehicles and buildings have been set on fire. Police fired over the heads of youths blocking the main road. Some of those fleeing the violence have taken shelter in some of the horticultural farms around Naivasha, our correspondent says. The area's huge horticulture and flower-growing industry employs more than 20,000 people, and supplies a third of Europe's cut flowers. Further north, Kenya's fourth biggest city Nakuru has also been the scene of deadly violence between rival Luo and Kikuyu communities.
At least 30 people have been killed since Thursday and scores of people were injured in clashes between fighters armed with machetes, spears and bows and arrows. There were no reports of further fighting from Nakuru on Sunday. But the ruins of torched buildings smouldered, and a reporter for news agency AFP said bodies lay in the city's deserted slums.
Annan call
Meanwhile, further south in Nairobi, Mr Annan has embarked on a sixth day of talks aimed at mediating a solution to the crisis.
He met Mr Odinga, after meeting Mr Kibaki on Saturday.
On Saturday, he visited Eldoret in the Rift Valley, scene of some of the worst post-election violence took place and spoke to refugees living in camps. "We saw gross and systematic abuse of human rights, of fellow citizens and it is essential that the facts be established and those responsible held to account," he said.
Fundamental changes, he added, were needed in Kenya to prevent a repetition of inter-ethnic violence. "We cannot accept that periodically, every five years or so, this sort of incident takes place and no-one is held to account," he said.