Kenya's Internal Security minister Prof George Saitoti, his deputy Orwa Ojode and four others were killed when a Police chopper crashed in Kibiku area in Ngong forest at 9am on Sunday, according to police sources.

Vice-President Kalonzo Musyoka who arrived at the scene later confirmed that the two ministers died in the crash along with Prof Saitoti's two bodyguards and two pilots.

The two were heading to Orwa Ojode's Ndhiwa Constituency for a church fundraising activity.

It's exactly four years when a chopper carrying MPs Kipkalya Kones and Lorna Laboso crashed in Narok.

According to an eye witness, the helicopter was seen diving from the sky and full of smoke before crushing and exploding into flames.

"The Chopper was filled with smoke before it crashed. I heard two explosions as it went up in flames," said Rose Kwamboka.

Meanwhile, Deputy Prime Minister Musalia Mudavadi has sent a heartfelt message of condolence to the families, relatives and friends of Prof George Saitoti and Orwa Ojodeh.

The DPM said the accident was horrendous and shocking.

Following the crash, the DPM has cancelled all planned political campaign engagements that would have seen him address supporters at Ziwa, Chepkoilel, Iten, Tabach, Kabarnet and Mogotio.

DPM broke the news to a shocked crowd at Kitale Bus Park on his way to Nairobi to condole with the rest of the cabinet.

The DPM said Kenyans should remain calm at this time of sorrow when the nation is mourning the great loss.

He termed the two nationalist and devoted public servants who have lend great service to Kenyans.