UPDATE THURSDAY: The Queensland Ambulance Service has confirmed that four people, including two children, were taken to hospital last night as a result of a serious traffic crash. 

The crash brought traffic to a stand-still on Walker St for a significant amount of time as queued up vehicles, including trucks, were unable to move until the scene was cleared. 

A spokesman for the Queensland Ambulance Service said two boys and a woman in her 40s were taken to hospital for spinal precautions. 

A man in his 30s was taken to hospital with chest and pelvic pain. 

A spokesman for the Queensland Police Service said it wasn't possible to speculate on the cause of the crash at this stage, but investigations were continuing. 

WEDNESDAY NIGHT: The intersection of Walker and Targo Sts is closed and traffic is being redirected after a two-vehicle smash just before 6pm.

Emergency crews including two police cars, ambulance officers and fire fighters rushed to the scene where a grey Holden Commodore station wagon and a white hatchback collided.

Debris is strewn across the road and damage to the vehicles is extensive.

Traffic in the area is backed up and motorists are being urged to take an alternative route.

Tow trucks have now arrived.

A witness said one of the cars was thought to have tried to make a u-turn at the intersection and the other car spun out and hit a pole.