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NAIROBI, Jan 19 (Reuters) - Five people in a refugee camp in Kenya's Rift Valley were killed on Saturday by opposition supporters in the latest flare-up in one of the regions worst hit by ethnic killings since a disputed election.

"A group of armed warriors attacked a village, leaving five people dead and property destroyed. These were refugees in a camp, people thought to have supported (President Mwai) Kibaki," Rift Valley Provincial Police Officer Everett Wasige said.

The camp is near a monastery in Kipkelion, 180 km (111.8 miles) northwest of Nairobi, he said.

That part of the Rift Valley has seen major clashes even prior to the election, mostly between the local Kalenjin tribe and members of the Kikuyu and Kisii ethnic groups, seen as backing Kibaki.

The opposition Orange Democratic Movement dominated voting in the Rift with strong support among Kalenjins, and the bulk of the 250,000 people who fled politically-fuelled ethnic clashes across the country came from there.

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