(adds background, details) NAIROBI, Jan 29 (Reuters) - Fighting between rival ethnic gangs broke out on Tuesday in Nairobi's Kibera slum, fuelled by killings in the Rift Valley and the shooting to death overnight of an opposition politician, residents said. A Reuters witness saw two corpses on the ground, with cuts on the head and neck. Another man was in a critical condition after being forcibly circumcised and cut in the leg. "There are groups attacking each other with bows and arrows," a Kibera resident said. Unrest also simmered in the Rift Valley towns of Nakuru and Naivasha, where scores of people have died in recent days in violence pitting members of President Mwai Kibaki's Kikuyu community against ethnic Luos, Luhyas and Kalenjins. Tyres were burning on streets of Naivasha, a Reuters reporter there said. Sparked by Kibaki's disputed re-election from a Dec. 27 vote, the violence has now gathered a momentum of its own, linked to decades-old issues of land, power and money. In Kibera, one of Africa's largest slum and scene of dozens of deaths during the month-long unrest, riot police were trying to separate the rival groups from before dawn on Tuesday, witnesses said. (Reporting by Joseph Sudah; Writing by Andrew Cawthorne)
A girl receives medical attention after she was wounded during post-election violence in the western town of Nakuru, Kenya January 28, 2008. Protests erupted in western Kenya and machete-wielding mobs faced ...
