In Sydney, a toddler left by his mother in a car with the windows up had to be freed by a man with a hammer, who realised the child was cooking in the heat.
The temperature continued to rise when the mother returned and was confronted by the rescuers.
Residents Pete Cassidy and Colin Grinyer saw the 18-month-old boy trapped in the car – sweltering in the heat.
Mr Cassidy freed the boy by smashing the window and gave him water to cool down.
Paramedics were called to the scene.
Police are continuing to investigate the incident.
3 News