The plane, carrying the minister from the Orange Democratic Movement (ODM), was operated by Nairobi-based Flight Trade Limited.
Salim Lone, a spokesman for the Orange Democratic Movement, said: "I am confirming that they were on the plane that crashed. I am not confirming that they are dead, but the police are confirming that all aboard died."

The ODM entered a power-sharing government with the party of Mwai Kibak, the president, after disputed elections in December caused widespread violence.