In early March 2007, the German newspaper "Bild-Zeitung" quoted the animal rights activist Frank Albrecht, who said that Knut should be killed instead of humiliated by being raised in a zoo. He declared that the zoo was breaking the rules of animal protection by keeping him alive. Wolfram Graf-Rudolf, the director of the Aachen Zoo, agreed with Albrecht. He stated that the zookeepers "should have had the courage to let the bear die". A group of children protested at the zoo, holding up signs that read "Knut Must Live" and "We Love Knut". Others sent emails and letters asking for the cub's life to be spared. Threatening letters were also sent to Albrecht. Berlin Zoo agreed to support the baby polar bear, and promised not to harm him.