received anonymously:

"In the night of 7 on 8 of september, we went out to the golf club which is hosting the prestigious KLM open golf tournament. As soon as we arrived we started digging up the putts. After totally destroying four greens and removing the putts we thought it was a good first lesson for KLM. KLM if you think you can get away with flying thousands and thousands of animals to laboratories worldwide you thought wrong. We will be wherever you go and wherever you think you can put your name up. This was just a small message to you, you are the one with the choice, do you want to let this escalate or get out of your filthy business."

Note: Air France-KLM is the world's largest carrier of primates and other animals for biomedical research.