WARSAW, Poland (AP) — Lightning struck across the Tatra Mountains in southern Poland and neighboring Slovakia on Thursday, killing five people and injuring over 100 others in an area popular with hikers and families, authorities said.

Witnesses said the thunderstorm came suddenly on a day that began with clear weather. The lightning strikes pummeled Poland's Giewont peak, a trekking destination that is 1,894 meters (6,214 feet) high, as well as other locations across the Tatras.

Four people were killed on the Polish side, including two children, a spokeswoman for the Polish air ambulance servi...