Child, 12, suffers broken leg and hip injuries after allegedly stolen car crashed into tree in Cranebrook

A seriously injured 12-year-old has allegedly been abandoned at the scene of a fiery car crash by two men, one of whom was carted away from the site in a shopping trolley, New South Wales police allege.

Police said they were later forced to use a stun gun on a dog as they tried to help paramedics treat one of the men as the incident evolved in Sydney’s western suburbs.

Before emergency services arrived, one of the men allegedly walked from the crash scene, police said. Another was allegedly taken from the scene by two men using a shopping trolley.

Paramedics were called to a nearby home soon afterwards for that injured man.

They sought police help to enter to the property to treat the distressed man, allegedly sparking a confrontation with two other men inside.

Those men, aged 40 and 55, were sprayed with capsicum spray and police stunned a dog with a Taser.

The injured man was later found and taken to Westmead hospital for treatment for a broken leg and head lacerations.

He has also undergone mandatory testing.