The first action should be taken when arriving on the scene of an emergency in which people have been injured is to call emergency help.
Also inspect how deep is the injury is and provide available first aid.
In the event of an accident, make sure both the injured party are not in any danger before proceeding. Assess the wounded individual when it's safe to do so, and if an ambulance is needed, call 999. Then you may do elementary first aid. Keep the incident scene safe and record it. The safety and security of the incident site should be a priority for an incident investigator.
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