As I passed down at a shortcut I usually use, I have come across the following:

It consists of a porcelain mug with water (or maybe other than water?) on it; 6 long brown cigarettes pointing to different directions and 1 at the top of the mug, all been lit; 7 nails; 7 red flowers; and black candle wax. I wonder what the greyish thing around the mug is.
I was with a friend of mine and neither of us touched it, we just walked by it and left it where it was, obviously in great astonishment. A few days later, I in my curiosity went there again and it was gone.
Would anyone know what this means or represents? Why would someone do this, with what the purpose? I have always sensed something not ordinary around those paths at which I found this, I guess I was not the only one.