After encountering a fight or other violent incident in public, the first principle is to ensure personal safety and comply with the law. If the incident involves personal injury or illegal behavior, you should immediately call the police and cooperate with the police investigation. Unauthorized handling of on-site traces may interfere with judicial procedures and even lead to legal liability. If the incident does not involve serious injury and ordinary traces (such as unintentional stains or scattered items) need to be cleaned up, the following are suggestions for protecting the public environment.： --- ###**Legal and safe processing steps**： 1. **Assess safety and legality** -Confirm that no one at the scene needs first aid. If someone is injured, **Immediately call the emergency number**. -If the incident involves illegal acts (such as intentional destruction, brawls, etc.), priority should be given to the police to protect the scene so that the police can collect evidence. 2. **Basic cleaning tools** (suitable for small-scale traces of non-crime scenes) -Use wet wipes, paper towels or drinking water you carry with you to clean up surface stains (such as beverage spills). -If there is debris (glass, plastic, etc.), it can be collected with a broom or cardboard and discarded in the trash can to avoid injury to others. 3. **Deal with blood stains or other biological contamination** -**Do not come into direct contact with blood** to prevent infection with diseases. - Contact the venue management personnel or professional cleaning personnel to deal with it (there are usually emergency plans for public places such as shopping malls and railway stations). 4. **Contact relevant departments** -Report the situation to the property, security or public place management department, who will conduct a professional cleanup or monitoring investigation. --- ###**Important reminder**： -**Legal priority**: Any cleanup behavior should not hinder judicial investigation. Intentional destruction of evidence may constitute a crime. -**Social responsibility**: The safety of public places needs to be jointly maintained, and timely reporting of problems is more important than covering up traces. -**Self-protection**: Avoid direct contact with potentially harmful substances (such as blood, chemicals) and wear gloves if necessary. If the incident involves a threat to the safety of yourself or others, please be sure to resolve it through legal means.