At least four people died and more than 100 were injured in lightning strikes during a thunderstorm in Poland, Prime Minister Mateusz Morawiecki says.

Axar.az reports citing BBC.

The worst bolt fell on a group of hikers at the summit of Giewont, a popular peak in the Tatra range in the south of the country.

A fifth person was killed in neighbouring Slovakia. At least one of the victims was said to be a child.

The storm is said to have descended suddenly after a sunny morning.

"Nobody expected such a sudden storm to break out and from our human point of view it was something which was impossible to predict," Mr Morawiecki said an emergency meeting in the region.

There were reports of casualties in different parts of the mountain range. At least four rescue helicopters were sent to the area.