This is awful to hear. If it's the same person or group, you might find some pattern based around weekdays, holidays, time of day, etc. Try labeling them based on date/time and see if you can run some summary statistics. If it's kids, it might increase during holidays. If it's someone jobless, there may be no pattern. This is all speculation, but it's a starting point.

Machine learning might be able to offer some insights as well, but that might be too steep a learning curve.

Good luck in finding them