Kenyan President Mwai Kibaki has formally named opposition leader Raila Odinga as prime minister, implementing a long-awaited power-sharing deal the two signed more than a month ago to resolve a protracted political crisis.

Kibaki unveiled the 40 cabinet ministers a day after holding closed-door talks with Odinga, leader of the Orange Democratic Movement.

The two leaders had agreed in February to share power after a dispute over who won Kenya's December presidential elections erupted in deadly violence.

At least one thousand people have been killed and hundreds of thousands of others displaced from their homes in the violence.

Meanwhile, former United Nations Secretary General Kofi Annan has urged Kenyan authorities to disarm the militias that have claimed scores of lives in the country.

Annan is the chief mediator in the talks that led to the power-sharing deal.

"You cannot have armed militia in a society like Kenya, there is no place for armed militia in such a society. They must be disarmed, they cannot be allowed to take the law into their own hands and I'm confident that the government will take measures, and is taking measures to disarm them."

Fourteen people were killed and public transportation in part of the country came to a standstill for four days last week when when Kenya's illegal Mungiki militia threatened to behead minibus taxi operators.

The clash ended after the new Prime Minister, Raila Odinga, issued a plea to stop the killings and destruction.

Annan was in Kenya to attend the swearing-in of the country's new coalition cabinet.