People pull the remains of a 250kg male polar bear away from the scene after it was shot by a member of a group of British campers on the central island of Spitsbergen in Norway's Svalbard archipelago in the Arctic August 5, 2011. The polar bear attacked the group on Friday, killing a 17-year-old boy and seriously injuring four people, Norwegian officials said.REUTERS/Scanpix NorwayRescuers carry one of the four youths injured in a polar bear attack on Spitsbergen August 5, 2011. The polar bear attacked a group of British campers on Friday, killing a 17-year-old boy and seriously injuring four people camping in Norway's Svalbard archipelago in the Arctic, Norwegian officials said. The patient was airlifted to the local hospital and then later to the hospital in Tromsoe on the Norwegian mainland. Picture taken August 5.REUTERS/Scanpix NorwayRescuers carry one of the four youths injured in a polar bear attack on Spitsbergen island August 5, 2011. The polar bear attacked a group of British campers on Friday, killing a 17-year-old boy and seriously injuring four people camping in Norway's Svalbard archipelago in the Arctic, Norwegian officials said. The patient was airlifted to the local hospital and then later to the hospital in Tromsoe on the Norwegian mainland. Picture taken August 5.REUTERS/Scanpix NorwayThe polar bear which attacked a group of British campers on Friday and was shot by one of the group members, is examined by experts in Longyearbyen August 6, 2011. The polar bear killed a 17-year-old boy and seriously injured four people camping in Norway's Svalbard archipelago in the Arctic, Norwegian officials said. Picture taken August 6, 2011.REUTERS/Scanpix NorwayThe camp where a polar bear attacked a group of British campers on Friday is seen in Spitsbergen August 5, 2011. The polar bear killed a 17-year-old boy and seriously injured four people camping in Norway's Svalbard archipelago in the Arctic, Norwegian officials said. Picture taken August 5, 2011.REUTERS/Scanpix NorwayA part of the tripwire system is seen at the camp where a polar bear attacked a group of British campers on Friday, in Spitsbergen August 5, 2011. The polar bear killed a 17-year-old boy and seriously injured four people camping in Norway's Svalbard archipelago in the Arctic, Norwegian officials said. Liv Asta Oedegaard, spokeswoman for the Svalbard governor's office, said the campers had surrounded their group of tents with a tripwire designed to set off a flare gun if touched by a bear. "If this tripwire worked, or if the bear crossed over it in a clever way, we don't know," Oedegaard said. Picture taken August 5, 2011.REUTERS/Scanpix NorwayThe polar bear which attacked a group of British campers on Friday and was shot by one of the group members, is examined by experts in Longyearbyen August 6, 2011. The polar bear killed a 17-year-old boy and seriously injured four people camping in Norway's Svalbard archipelago in the Arctic, Norwegian officials said. Picture taken August 6, 2011.REUTERS/Scanpix Norway