The death toll in the Wellampitiya accident last night has risen to four, the police media unit said this morning.
A van heading towards Kaduwela collided with a bus and a lorry while attempting to overtake another vehicle resulting in the fatalities.
The driver of the van and three others including two women were killed in the accident, the police media unit said.
The police said that nine people who were injured in the accident are receiving treatment at the Colombo national hospital.
Of those injured are two children. The driver of the bus and lorry have been arrested.