stolen Columbia Mountain bike

The bike was in the back yard, you couldn't see it from the road, only my back yard neighbors can see into my backyard. video footage from neighbors doorbell ring has nobody going through the front yard. It had to be someone that heard my vehicle start up and me leave, and they went through fenced in back yards to steal it. My gate was closed when i left, when i returned home about an hour later the gate was open. They must have realized they'd be seen if they left through the front of the house, so they went back over the fences with two bikes. It was a baby blue and white columbia woman's 18 speed. After a theft of another bike, there were modifications added proving its our bike. Plus i have pictures.