Norway has suffered the worst violence since World War II with at least seven people killed in an explosion at a government building and many more shot dead at a youth camp.
These are acts of terror although it is not yet known if they were acts of terrorism.
Regardless of who was responsible, it is a reminder of how vulnerable we all are.
When we were in New York earlier this month we had to pass through x-rays at the entrance to places like the Statue of Liberty and Empire State Building. But there were many other places with no obvious signs of security where someone determined to unleash terror could have done so.
Today’s attacks in Norway show it is impossible to guard everyone everywhere and no-one should try to. Just as the British people learned to live with the threat of IRA bombings in the 1970s and 80s, we must accept sensible precautions but not let them curtail our freedom.