July 22, 2011 has been described as the day Norway cried. After detonating a car bomb in Oslo, killing eight and injuring many more, Anders Breivik took a ferry to the island of Utoya. There, dressed as a policeman, he began a murderous spree, hunting down and indiscriminately shooting young people on the island who were attending a youth camp. Seventy seven people were killed in total, many of them teenagers, and hundreds injured. This was the worst mass murder in Norwegian post-war history and the whole country was in shock. But Norway used this national tragedy to pioneer new ways of caring for their citizens. Claudia Hammond reports on the ground-breaking new ways Norway has been road testing to deliver psychological and mental health support to those who survived, and to those who lost relatives and friends.