anonymous report (translation):

"From Saturday night, April 2nd, to Sunday the 3rd, all the locks of AveNatur were filled with pieces of metal and glue. They have two stores near the Madrid flea market. Sunday is the day of highest traffic to the flea market."

Spanish:
"La noche del sábado 2 de Abril al domingo 3 se llenaron con trozos de metal y pegamento todas las cerraduras de AveNatur, que dispone de dos establecimientos en la zona del rastro de Madrid. El domingo es el día de máxima afluencia al rastro."