Thirteen people were killed overnight in Nairobi and flashpoint western regions, police and medical sources said on Tuesday, as fresh tribal violence linked to last month's polls raged in Kenya.
"Police patrolling the Nakuru-Eldoret highway saw about 50 men armed with bows and arrows" in the town of Cheptiret, some 20 kilometres (12 miles) from Eldoret, Rift Valley province police commander Joseph Ashmalla said.
"The men attacked police forcing police to fire back, killing three of them while the rest fled," the police commander added.
The western town of Eldoret is a bastion of opposition leader Raila Odinga, who accuses President Mwai Kibaki of rigging his way to re-election in the December 27 polls.
Eldoret saw some of the heaviest violence since the dispute sparked the country's worst crisis in 25 years and touched off riots, protests, police raids and tribal killings that have already left close to 1,000 dead.
A mortuary attendant in Eldoret also told AFP that the bodies of six people who were killed in overnight tribal clashes were brought in.
"We have received six bodies since Monday evening," the attendant told an AFP correspondent in Eldoret on condition of anonymity.
At least four people were also hacked to death in the Kibera slum -- Nairobi's largest -- following the overnight murder of an opposition MP, a police commander told AFP.
"Four people have been killed and we have reports that three others might have been hacked to death but we cannot access them," the police official said.
The deaths occurred after an opposition MP was shot dead in front of his home, in the highest-profile killing since the dispute erupted over Kibaki's re-election.
Odinga, who enjoys wide support in the country's slums, has said he suspected his political "adversaries" were behind the murder, fueling fears of a fresh eruption of violence across the country.