Captain Barbra Wangeci Kamau and her First Officer Jean Mureithi last communication with the control tower at JKIA was when the aircraft was about 60 kilometres from its destination.
Last signals, he said, were picked around Njambini area.
Assistant Director in charge of Mountain Areas Simon Gitau told the Nation that a phone signal of one of the occupants had been detected in the Aberdares in Nyandarua County.
Aerial search teams spotted wreckage on a densely forested cliff in the Aberdare Range in central Kenya, said Paul Maringa, principal secretary at the ministry of transport.
There was no clear indication if there are survivors.
Rescue teams on Wednesday are looking for a small plane with 10 people on board that went missing north of the Kenyan capital Nairobi, the aircraft owners and the national disaster agency said.
Thursday Schedule: Nadal-Schwartzmann and Cilic-del Potro
Del Potro, the US Open victor in 2009, is playing the tournament for only the second time since 2012 after a spate of injuries. Canada's Gabriela Dabrowski and Croatia's Mate Pavic lost their mixed doubles final at the French Open on Thursday.
The missing Cessna C208 plane.
It is believed they had flown into a bad storm.
The missing 12-passenger plane is operated by East Africa Safari Air Express (FlySax), a subsidiary of Fly540.
Search for the plane, its crew and passengers is still ongoing.
The airline said the plane was missing and that efforts by Kenya Civil Aviation Authority, Kenya Wildlife Service (KWS) and Air Accident Investigation Division of Kenya to locate it were ongoing.