One of Us: The Story of Anders Breivik and the Massacre in Norway by Ǻsne Seierstad:
Norway owns a single police helicopter. And in July, the helicopter service was on holiday. As a consequence of new savings measures, there was no emergency crew cover at the height of the summer. The first pilot nonetheless reported for duty right after hearing about the bomb on the news. He was told he was not needed.
Yet the emergency response unit requested use of the helicopter twice in the hour that followed. The squad was informed that the helicopter was unavailable, even though it was on the tarmac, fully operational and ready to fly. Nor did the police take any steps to mobilise military helicopters or make use of civilian helicopter companies.