I have seen this recently on social media and even forwarded on myself - which I should know better. I usually check them out before hand but I saw CNN and Fox so thought this must be true. Then thought more of it after I had forwarded it on to my friends. So much for believing things on social media even when they site news reports :).
Even though there is no credible evidence that this is occurring, I would not doubt that this has occurred somewhere. After all, someone had to at least think of the idea or knows that it happened for it to be written. So, I always encourage people to proceed with caution and to listen to your inner voice when helping others. Nowadays, most people have cell phones and if a child is lost and crying, if they know their parents phone # then I would call them, if not, I would call the police and let them take them home. They get them home safely and it keeps you safe at the same time.