this is a new HRW report just out that says Kenyan officials olotted much of the post-election violence
Report: Kenyan officials plotted attacks that killed hundreds

NAIROBI, Kenya — A leading human rights group said Monday that Kenyan political and business leaders plotted much of the country's recent ethnic violence, and it urged the new coalition government to bring the organizers to justice.

New York-based Human Rights Watch found evidence that hundreds of people were killed in planned ethnic attacks following the disputed presidential election in December. In many cases, the group said, the attacks were planned and financed by prominent civic leaders, although the group didn't directly implicate any top national politicians.
The full report can be downloaded here

From the report's summary:

Summary

The scale and speed of the violence that engulfed Kenya following the controversial presidential election of December 27, 2007 shocked both Kenyans and the world at large. Two months of bloodshed left over 1,000 dead and up to 500,000 internally displaced persons in a country viewed as a bastion of economic and political stability in a volatile region.

The ethnic divisions laid bare in the aftermath of the elections have roots that run much deeper than the presidential poll. No Kenyan government has yet made a good-faith effort to address long simmering grievances over land that have persisted since independence. High-ranking politicians who have been consistently implicated in organizing political violence since the 1990s have never been brought to book and continue to operate with impunity. Widespread failures of governance are at the core of the explosive anger exposed in the wake of the election fraud.