First, make sure you are safe, and then contact the police. If possible, make written notes of what you have seen, including descriptions, times and locations, while your memory is still fresh. If the situation is an emergency, call 911. If it is not an emergency, call Brentwood Police dispatch at 314.644.7100. Follow the directions and answer the questions being asked. Remain calm. It may be necessary for the police officer to speak with you directly; be prepared to meet the officer or provide a contact number.