OSLO, Norway - (AP) - A Norwegian gunman disguised as a policeofficer beckoned his victims closer before shooting them one byone, claiming at least 84 lives, in a horrific killing spree on anidyllic island teeming with youths that has left this peacefulNordic nation in mourning.

The island tragedy Friday unfolded hours after a massiveexplosion ripped through a high-rise building housing the primeminister's office, killing seven people in a scene some likened tothe aftermath of 9/11.

The toll in both attacks reached 91 Saturday, and police saidthat could still rise as they search the waters around the islandfor more bodies. Acting Police Chief Roger Andresen said he did nothow many people were still missing.

The same suspect - a blonde-blue eyed Norwegian with reportedChristian fundamentalist, anti-Muslim views - is suspected in bothattacks. He has been preliminarily charged with acts of terrorism.

On the island of Utoya, panicked teens attending a Labour Partyyouth wing summer camp plunged into the water or played dead toavoid the assailant in the assault that may have lasted 30 minutesbefore a SWAT team arrived, police said.

Prime Minister Jens Stoltenberg said the twin attacks madeFriday peacetime Norway's deadliest day.

"This is beyond comprehension. It's a nightmare. It's anightmare for those who have been killed, for their mothers andfathers, family and friends," Stoltenberg told reporters Saturday.He said he would meet victims later in the day on Utoya.,

The carnage began Friday afternoon in Oslo, when a bomb rockedthe heart of Norway. About two hours later, the shootings began ata retreat for ruling Labour Party's youth-wing, according to apolice official. The gunman used both automatic weapons andhandguns, he said. It was not clear Saturday whether experts hadsucceeded in disarming a bomb that the official said had been leftunexploded.

The blast in Oslo, Norway's capital and the city where the NobelPeace Prize is awarded, left a square covered in twisted metal,shattered glass and documents expelled from surrounding buildings.

The dust-clogged scene after the blast reminded one visitor fromNew York of Sept. 11. People were "just covered in rubble,"walking through "a fog of debris," said Ian Dutton, who was in anearby hotel.