U.S. envoy Jendayi Frazer said Wednesday the violence in Kenya's Rift Valley was "clear ethnic cleansing," aimed at chasing out President Mwai Kibaki's Kikuyu people.

Frazer said she did not consider the eruption of ethnic clashes in Kenya a genocide.

The violence she saw during a visit earlier this month to the country's western region, where the fighting has pitted Kalenjin people against Kikuyu, "was clear ethnic cleansing," she told reporters on the sidelines of an African Union summit in Addis Ababa.

"The aim originally was not to kill, it was to cleanse, it was to push them out of the region," she said.