REGINA - RCMP say a seven-year-old boy from Turner Valley, Alta., and his 11-year-old sister are among the four dead after a collision between a Canadian Pacific train and a camper van in Saskatchewan.

The crash Thursday evening was at an uncontrolled crossing near Broadview, about 150 kilometres east of Regina.

Another sibling, a 15-year-old boy who was driving, was also hurt.

It is legal in Saskatchewan for 15-year-olds to drive if they have a learner's permit and an adult is in the vehicle with them.

The children's 42-year-old mother was also injured in the crash.

An 11-year-old girl from Chestermere, Alta., and an 18-year-old woman from the Whitewood district in Saskatchewan were also killed.