Five people died and over 150 were injured after powerful thunderstorms struck Poland’s Tatra Mountains; it prompted the head of an emergency services team to liken the event to a terrorist attack.

Thursday began with clear skies before a sudden afternoon thunderstorm in the mountain range. Lightning struck a metal cross, surrounded by a metal chain, on the Giewont peak at an altitude of 1,894 meters (6,214 feet), and then hit a group of 25 tourists.