What is the first step in the Chain of Survival when arriving at a serious road traffic accident with unconscious casualties in Bosnia and Herzegovina?

1. Assess scene safety and secure the accident site (warning triangle, hazard lights, high-visibility vest) to protect victims and rescuers from secondary collisions
2. Drag all victims out of vehicles immediately without checking for spinal injuries
3. Take photos and videos for social media
4. Search the victims' pockets for personal belongings