Emergency services rushed to Yanchep National Park after four people were hit by a falling tree branch on Thursday afternoon.

The incident happened about 2pm in the vicinity of Wanneroo Road, with three people taken to Joondalup Hospital with minor injuries while a fourth person was rushed to Royal Perth Hospital with suspected spinal injuries.

The Department of Fire and Emergency Services said the RAC Rescue chopper was dispatched to assist the emergency situation just after 3pm.

Vision from Nine News Perth's chopper showed a massive gum tree branch on the ground with ambulance officers nearby treating the injured.

More to come.