At least two people have died and many injured following an explosion after an oil tanker and a Mombasa-bound bus collided head-on at Mundika, Busia.
National Transport And Safety Authority (NTSA) and the Energy and Petroleum Regulatory Authority (EPRA) in a joint statement said 10 people were involved in the crash.
Eight who survived were nursing injuries at the Busia County referral hospital.
Witnesses and rescuers said they saw two bodies while many were taken to hospitals with multiple injuries after the Friday afternoon incident.
There were fears the death toll would increase, police said.
According to the Kenya Red Cross, fire erupted after the collision.
The Kenya Read Cross and County Fire Brigade arrived at the scene of the accident.
Busia Governor Paul Otuoma said security agencies have launched investigations to find the cause of the accident.
"As authorities investigate the cause of the accident with a view of taking action, I would like to remind drivers and other road users to always exercise caution to avoid such tragic incidents," he said.
"At this point, I wish to extend my heartfelt condolences to the families of fellow Kenyans who have lost their lives in this tragic road accident in Busia County and wish those in hospital quick recovery."
Busia Senator Okiya Omtatah also condoled with the families who have lost their loved ones.
"It is with shock and disbelief that I have received the sad news of the tragic road accident between an oil tanker and a PSV bus bound for Mombasa in the Mundika area," he said.
"I extend my deepest condolences to the families and friends. My thoughts are now with the victims and their families."