stolen 2019 Kona Dew Plus Bike 55cm

I park my bike at the parking at Lloyd Center shopping mall as usual at 18:30, lock my bicycle with an U lock and go to my English class inside the mall, when I returned about 21:00 it was lost, I found just the front tire and the U lock . The week before it was stolen my red back light in the same area. This place has a lot of cameras and it is behind a bus stop. Probably someone has seen something, I hope