Lightning in Poland kills five and injures more than 100

Lightning strikes from a sudden thunderstorm in Poland's Tatra Mountains have left five people dead and more than 100 injured.

Five people are dead and more than 100 are injured after a storm struck in southern Poland. (AAP)

Lightning has struck across the Tatra Mountains in southern Poland and neighbouring Slovakia, killing five people and injuring more than 100 others in an area popular with hikers and families.

Witnesses say the thunderstorm came suddenly on a day that began with clear weather.

Four people were killed on the Polish side, including two children, Polish air ambulance service spokeswoman Kinga Czerwinska told the news broadcaster TVN24.

An injured tourist is transported to the hospital in Zakopane, Poland. Source: PAP

Slovak authorities said one person died in their nation.

The lightning strikes hit the Giewont peak as well as other locations across the Tatras on Thursday.

Some of the injured were brought by helicopter to a hospital in the Polish mountain resort of Zakopane.

Prime Minister Mateusz Morawiecki, who went to Zakopane, said some among the more than 100 injured were in a very serious condition with severe burns or head injuries.