Nearly two years after brokering a power-sharing deal between Kenya's rival politicians, Kofi Annan, the former UN chief, is back in Kenya on unfinished business.

He is pressing for reforms promised as part of that agreement.

Without them, many fear a return to the wave of tribal violence that killed 1,500 people in the wake of the 2007 election.
  
Mohammed Adow reports from the Kenyan capital, Nairobi.