What is the first step a supervisor should take in response to a harassment complaint?

After listening attentively to the allegations of harassment, the first step a supervisor suppose to take in response to a harassment complaint is to take immediate protective actions that will ensure the safety of the harassed person pending the time that full investigation will be conducted. After thorough investigation, all the parties involved should be informed about the outcome of the investigation and appropriate corrective actions should be taken to enforce anti-harassment policy.