stolen 2012 Diamondback Clarity 1

My two bikes are always u-locked together and then cable locked again to the railing of my apartment's interior stairs on the second floor in front of my apt door. The building has a locked front door that only the residents have access to unless they bring guests. With that said, my bikes was very secure. Monday evening I saw them in their usual place at 6:30pm. I didn't hear any unusual sounds that evening. When I passed by again around 9:00pm, they were both gone. I think my neighbor's orange Trek is missing as well but they haven't been home for me to ask. There are several other bikes (less securely locked) on the second floor that were untouched. When I realized what had happened, I ran downstairs of the building and saw that the main front door was being held wide open with the mat rolled up underneath it. I believe the thieves cut the cable lock and grabbed my two bikes still attached to one another with a heavy duty U-lock. My main bike, the white Diamondback, is the one I care about most out of the two. It is white with black handle bars. There is a black rear rack with a black plastic lockable topcase trunk attached to the rack. There is a red water bottle cage as well. Inside the trunk was my grey Bern helmet, hand pump, Blackburn Flea front and rear lights, bungee cargo net, Topeak folding bike tool, and a packable bag. It is pretty recognizable and looks a little like a police bike actually. It also has Wheel Brightz lights on both of the wheels. Blue in the front and red in to back so at night that is a huge distinction of my bike. They are very bright and go around the entire wheel.