A Kenyan military plane crashed into a hillside on Monday and burst into flames, killing 14 people including two deputy ministers and four members of parliament.
"It is with deep sorrow and regret that I have received the news of the deaths of 14 members of a peace delegation," President Mwai Kibaki said in a televised address in which he announced three days of national mourning.
It was the east African nation's worst air disaster since a light aircraft slammed into Mount Kenya in July 2003, killing 14 people, including 12 members of an American family.
Witnesses said the Y-12 plane carrying 17 people on a mission to mediate between feuding communities crashed into the hill as it approached the airstrip in Marsabit, a remote north-eastern outpost. It then exploded into a ball of fire.
In pounding rain, Red Cross workers placed plastic white sheets over bodies so charred they were beyond recognition.
Burnt, broken limbs were strewn over the mangled wreckage of the plane, split into pieces with only its tail intact.
Officials said the crash may have been caused by bad weather conditions including heavy rain and thick fog.
Three survivors - including a provincial commissioner and two crew were airlifted to hospital in the capital Nairobi.
Among the dead were six members of parliament including assistant minister for internal security Mirugi Kariuki and assistant minister for regional development Titus Ngoyoni.
The other legislators on the Kenya Air Force plane were from Marsabit, Moyale and the East African assembly.
The other victims included an Anglican priest, two pilots, a police constable, and four government officials.