I am very sure my sister and her friends destroyed our family's decorations ?

My sister and I worked all last weekend to set up our family's decorations, and my little sister neglected to help with them. We have these animated deer we put in our lawn. While my little sister was at her friend's down the road, I heard someone running around the driveway from my room. I was tempted to see what was going on, but figured it was my sister and her friends coming to get something from the house and ignored it. Bad idea. My older sister and I just found our deer beaten down and now completely broken. Also, my little sister mysteriously bruised her toes, ironic isn't it. I pointed this out to my older sister and she agrees. We have no proof though. The weird thing is, our neighbors have the same deer, and all are fine. Obviously, this was a direct aim for our house, since we even had lights on, unlike our neighbors. Here's my question, is there anything I can do about this? Obviously I'm telling my parents all of this in the morning, but what else can we do? I'm really hoping we cant just let this go unnoticed...