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Norway fiend loaded up on US mail-order ammo

Massacre madman Anders Behring Breivik reportedly ordered the ammunition he used to gun down young people at a Norwegian island campground from the United States.

Breivik purchased 10 magazines for $550 in December and January by mail from various undisclosed dealers, a Norwegian newspaper said yesterday.

In his manifesto, he also claimed to have bought four 30-round clips in Norway, the paper reported.

Meanwhile, it was learned that when police stormed the island of Utoya, where Breivik allegedly killed 68 people on July 22, he chillingly said, “I’ve finished now.” The crazed killer had thrown his weapons 15 yards and was waiting, hands on head, to be arrested.

A teen who survived the slaughter, Emma Martinovic, 18, wrote on her blog that she witnessed a camper’s head “explode” from a bullet.

Another eight people died earlier in the day from explosives Breivik allegedly planted in Oslo.

But investigators have found no signs of a larger conspiracy.

It appears the right-wing extremist sociopath acted alone and kept his plans under wraps for more than a decade, a top security official said yesterday.

“He is total evil,” said Janne Kristiansen, director of the Norwegian Police Security Service.

In another development, cops across Europe were on high alert for copycat terrorists after Finnish police arrested an 18-year-old man who bought 22 pounds of fertilizer to build explosives from the same outlet where Breivik purchased his materials.

andy.soltis@nypost.com