Dangerous little boys

Yesterday we went to Hluboka to a nice children's playground. It is huge and quite good for kids, although not so much for the really young ones. 

We were sitting on this huge trampoline (has to be seen to be believed). Alex had walked a little away from us and we saw this boy about three with his hands around Alex's neck. I went over and told him not to do that, but he did it again. So I brought Alex with me, but the boy followed. The concerning thing was that there was no adult caring for him. He just was wandering around. Almut spoke to him later and he said that his mother had gone for a drink. A bit worrying.