I had around £1,300 of camera equipment stolen from me when I was in the room right next door to it too. Thieves don't care what it takes to make a quick quid or two - despite the potentially devastating consequences for the victim. In my case insurance not covering the loss and being unable to replace said stolen equipment. Still, the guy who did me over is banged up now so there's some comfort in that. Doesn't replace my camera and lens though. Heartless Barclay's bankers.
Sorry to hear about that. It's so frustrating!
At the end of the day I'm just glad that nothing worse happened. They were in the next room to us and far more could have happened then them grabbing my phone and a bag.