A pupil was killed instantly while three others were seriously injured following an accident involving their school van.
The Highway Academy learners were being taken to school during the Tuesday morning incident in Narok town.
Narok North OCPD Joseph Kisombe said the driver, who is on the run, lost control of the vehicle and landed in a ditch.
The injured were rushed to Narok county referral hospital. Medics said they were stable.
Witnesses said the van was speeding and went off the road at a bend.
The car was towed to Narok police station awaiting inspection.