The Norwegian police have defended the time it took for them to respond to initial reports of the shooting on Utoeya.
No helicopter was available so the special firearms unit had to make the 45 kilometre journey from Oslo by car.
When they arrived at the shore, the police boat was too small to take them and they had to commandeer local boats to cross.
Officials have dismissed claims of a 90 minute delay.
“The local police took the first call about this at 17:26. Our counter-terrorist unit was on site on the island at 18:25 and the suspect was arrested at 18:27.”
The exact duration might be disputed, but what it does mean is that the gunman had at least one hour to go about his deadly work unchallenged.
Hundreds of people, many of them teenagers, fled around the island to hide or jumped into the Tyrifjord in a bid to escape.