This might probably be a new methodology of theft. This happened to me in Segovia.
While I was admiring the San Jose Convent Segovia, a man passed me and suddenly both I and him (of course I got the brunt of it) got splashed with what appeared to be bird-droppings. We immediately looked skyward and he exclaimed bird droppings and offered to assist in cleaning my stained jacket and also vocalised that the camera hanging round my neck was also contaminated. He brought me to a nearby running water tap at the quiet (at that time) park. I had to put my camera and backpack down, removed my stained jacket and bent down to wash my face. I suddenly realised a man passing behind us and immediately got up to see my backpack and camera in his hands. Fortunately I raised my voice and he returned my things to me under the pretext of wanting to help me clean my camera.
So watch out for these two dark-looking gentlemen.(not blacks). Help me to bring them to justice - I thank you.