Four young men have been found strangled and dumped in vehicle in a garage at Gitaru in Kikuyu, Kiambu County.
Police say the vehicle, which was parked at the garage on Wednesday morning, spent the whole day there without mechanics inspecting its cargo.
The man who parked it left and Kikuyu police chief Joseph Ongaya said they were hunting for him.
Also wanted is the owner of the vehicle, whose identity police are likely to get from the Kenya Revenue Authority.
Mr Ongaya on Thursday told the Nation that the bodies had head injuries that they suspected were caused by blunt objects.
The corpses did not have any identity documents and have been taken to the City Mortuary in Nairobi.