During the night of August 12-13, nets were cut that imprisoned thousands of quail at a farm in Castelvetro. A group called "Neri come la notte" ["Black as the night"] claimed responsibility in an anonymous letter sent to the Gazzetta di Modena newspaper. In the letter, the action was dedicated, "To Billy, Costa and Silvia, because it is in direct action that we continue on the common path that leads to the destruction of civilization, because it is with action that our hearts can feel close to them."