More than 300 wild reindeer were recently killed by lightning at a Norwegian national park, officials say. The Norwegian Environment Agency has released haunting images of reindeer—including 70 calves—that seemingly fell over where they stood in the grasses of Hardangervidda, the largest high mountain plateau in northern Europe. The national park, the largest in Norway with wild reindeer populations, spans some 8,000 square kilometers (3,088 square miles) and is home to 10,000 to 11,000 wild reindeer. While specifics on the lightning strike are still unknown at this time, it’s likely that the dead reindeer were a herd that huddled together to weather a severe thunderstorm that rolled through the area on Friday.