Have you ever heard of hi tech pickpocketing? Apparently, it's a form of stealing without actually physically taking your valuables. Can you just imagine what will happen if this phenomenon have become widespread? Right now, the best thing to do would be to follow as much safety precautions as you can.
If you carry a bag with you, make sure that you keep it in front of you and that you keep an eye on it. Even if you're talking with somebody while on a public vehicle, make sure that you know where your bag is. Also, you should avoid bringing valuable items like gadgets and laptops. If it can't really be avoided, maybe you should consider putting on an extra security measure, like a lock for your bag. I know it sounds really paranoid, but I think it'll really help to secure your things.
Got any other tips to share?