A Norwegian dressed as a police officer gunned down at least 84 people at an island retreat before being arrested, police said Saturday. Investigators are still searching the surrounding waters, where people fled the attack, which followed an explosion in nearby Oslo that killed seven.

The mass shootings are among the worst in history. With the blast outside the prime minister's office, they formed the deadliest day of terror in Western Europe since the 2004 Madrid train bombings killed 191.

Police official Roger Andresen told reporters that the total death toll was now 91 and that a suspect was in custody being questioned for both assaults and is cooperating with the investigators.

Though police did not release his name, Norwegian national broadcaster NRK identified him as 32-year-old Anders Behring Breivik and said police searched his Oslo apartment overnight. NRK and other Norwegian media posted pictures of the blond, blue-eyed Norwegian.

I have no idea how a man can gun down 84 people with nothing but a pistol before anyone manages to stop him.

Don't think it's an attack from our friends in the middle east.

I'm fairly sure he did it all himself?

That he did. Bombs first though so hes right in that it probably pulled officers away...however what i meant was if he shot 84 people...why did nobody stop him? Unless he had perfect aim you have to presume he missed a lot as well..a handgun holds what? I've no idea actually but it's not a lot.

Now I know it's easy to sit back and make claims now but i like to think if i'd been there I'd have gone for the **** when he was reloading. Better than waiting for him to shoot me down. On the other hand maybe I'd be too scared to do ****. Guess it's hard to make such claims but 1 out of 80+...eh