Stencils from Zaragoza, Spain

I spent last weekend in Zaragoza, Spain. I actually didn't expect to find many stencils there but fortunately, I was wrong and found quite a few. And really good ones !!! Here are the first ones. They were all in the same spot and look like they are the work of a same artist. Any idea ? One is the boy from the movie "City of God"(Cidade de Deus).