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Resist the urge to interfere. Call the police. Seek help from the staff at an airport or bus station. Contact a human trafficking organization.

Article:
It may be tempting to speak up or help the victim in another another way, but doing so could put your own safety at risk. Instead, take clear, detailed mental notes about everything you see. That way, you’ll be better able to explain the situation once you get in touch with someone who can help.  Stumbling upon a case of human trafficking is a nerve-wracking experience. Do your best to remain calm. Remember that you're doing the right thing by looking out for your own wellbeing as well as that of the victim. Avoid drawing attention to yourself. The suspected trafficker will be more likely to try to get away if they think they might get caught. Dial your country’s emergency response number and inform the dispatcher that you believe you’ve encountered a victim of human trafficking. Specify your location and the exact signs or behaviors that made you suspicious. Your local law enforcement agency will send out an officer to assess the situation. They may also relay your report to another agency that specializes in kidnapping and human trafficking offenses.  You may be expected to provide further information, including a detailed description of the person and anyone they happen to be with. Ask to remain anonymous if you’re feeling uneasy about getting involved. If you get a bad feeling while traveling, head directly to the customer service office and tell the person in charge about what you’ve seen. They’ll alert the authorities, and may even be able to delay the flight or trip in order to help detain the suspected trafficker.  Professionals like flight attendants, customs agents, and conductors are often trained to spot and respond to instances of possible human trafficking.  On-site police or security will then be able to apprehend the suspect and get the victim to safety. If the victim has moved on or isn’t in immediate danger, call the National Human Trafficking Hotline at 1 (888) 373-7888. You can also text “HELP” or “INFO” to “BeFree” (233733). Groups like these provide emergency aid and other resources for victims of trafficking and people who are courageous enough report the crimes they uncover.  If you’d prefer, you can submit a report online by going to https://humantraffickinghotline.org/report-trafficking and filling out the included form. Many of these organizations also offer the services of crisis counselors to those who have experienced the traumatizing effects of human trafficking. Don't hesitate to reach out to one of these people if you've been affected by what you've witnessed.