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A reindeer mass death has scientists in Norway scratching their heads.

Officials said a lightning strike killed 323 reindeer on a mountain plateau. Experts don't know if the reindeer were killed in a single strike or multiple. It's common for the animals to huddle together during a storm.

Lightning strike kills more than 300 reindeer in Norway https://t.co/AVXHabznmm pic.twitter.com/fK63D8i56Y — KOKH FOX 25 (@OKCFOX) August 29, 2016

The creatures were found piled on top of each other, many with their antlers tangled, in the isolated area. Five of them were found alive but injured, and had to be shot. 70 calves were among the dead.

A spokesman for the country's environmental agency said it's not unusual for animals to be killed by lightning, but this was an unusually large number.

"We've never had anything like this with lightning," Kjartan Knutsen said.

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