The identification process of bodies of the victims of the Naivasha explosion accident began Monday at the Chiromo mortuary.
At least 33 bodies are set for identification, the Nation has reported.
St John Ambulance communications manager told the Nation that government pathologists will begin post-mortem from Tuesday.
However, the families of those who were burnt beyond recognition may be forced to wait for two weeks for DNA tests to be concluded.
Majiwa said those wishing to support friends and relatives can send their food and refreshments donations to Chiromo mortuary.
St John Ambulance is among agencies such as the Red Cross, National Disaster Operations Centre. and National Disaster Management Unit who are supporting friends and relatives of the deceased at the morgue.
Besides, the relatives are also being offered psychosocial support to help them deal with the traumatising process of body identification.
At least 39 people died Saturday night after the driver of a lorry transporting inflammable chemicals to Uganda allegedly lost control and hit vehicles from oncoming traffic at Karai area on the Naivasha-Nakuru road.
Health Cabinet Secretary Cleopa Mailu is Monday also expected to visit survivors of tragedy who are fighting for their lives at Kenyatta National Hospital.
A multi-agency team has launched investigations into the cause of the accident.