One police officer has been run over by a reversing car while another has been shot in the arm in an incident in Sydney’s inner west.

Four officers were on Friday evening approaching a car parked at an Earlwood reserve when the vehicle began to reverse, striking an officer.

Police say one of the four officers then discharged his gun, with a fragment of the bullet striking another officer in the left forearm.

That officer will undergo surgery on Saturday to remove the fragment.

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The driver of the vehicle, a 26-year-old man, and his female passenger are yet to be charged.