The Police said the accident took place near the 65th Mile Post along the expressway early this morning.
The van in which the foreigners were travelling had crashed into a container lorry which was parked along the expressway.
It was reported that the lorry had a flat tyre and had been parked on the side of the expressway when the van crashed into it.
The Police said that an Australian woman and a 4 year old child were killed in the accident while two others sustained injuries and were admitted to hospital. (Colombo Gazette)