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Now that you know who to contact in the event of abuse, do so! Provide them with factual statements (preferably written) of what was seen, what happened, where it happened, when it happened, how it happened, etc. If you have any videos, pictures, recordings, etc, offer them to whomever you speak to. Many agencies have computerized reporting systems that will take your report online. You may have the opportunity to upload any video or photos you have taken. You will be encouraged to provide as much detail as you can about the incident you are reporting. If you don't wish to meet an agent or be involved in the case you can do anonymously, but the case would best be pursued if there was a credible witness. If your report leads to an arrest and prosecution, you may be asked to testify. After you have filed your report, keep a precise written record of who you spoke to, when you spoke to them, and what the outcome of that discussion was. If nothing came of it try contacting someone else, ask to speak to a supervisor, or, if not already there, contact the local police. If you don't receive a reply in a reasonable amount of time, call back, or contact another agency.
Make the call. Report online. Keep records. Follow up.