Six Irish people have been airlifted off Sweden's highest mountain this morning after being stranded overnight.

The President of the Swedish Mountain Rescuers National Organisation told RTÉ News that the group were not professional climbers and some were wearing t-shirts and shorts.

However, Rickard Svedjesten said that "everyone is fine" despite their ordeal on Kebnekaise.

The mountain has a peak of 2,103 metres, more than twice that of Carrauntoohil, Ireland's tallest mountain.

Mr Svedjesten said the crew were unable to send a helicopter up to rescue the group last night because it was too cloudy.

He said: "It started last night at 9.30pm. The Mountain Rescue got an emergency call.

"It was that there were three climbers lost on the biggest mountain in northern Sweden, Kebnekaise, but that information was wrong.

"They were not climbers. They had no equipment, and their clothing was very bad.

"There was six people and they were aged around 30."

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Mr Svedjesten said there is a good mobile signal across the whole Swedish mountain range and they were able to stay in a hut on the mountain overnight.

He later said that the group of six men did very well to stay warm in temperatures of -10C overnight.

He said that the group of Irish men all work in Sweden and had very little experience of hiking in that environment.

Mr Svedjesten said that while one of the group was pretty well prepared with decent clothes and equipment - the rest of the group did not have the proper shoes or clothes needed for the conditions.

The group were airlifted to the closest road this morning and from there they were transported to hospital in the city of Kiruna.

They were treated for hypothermia but are said to be doing well.

Mr Svedjesten said it begins to snow in the region in late August and early September and temperatures can drop well below zero.

He said that everyone - tourists and locals - make the same mistake and he recommended that people check ahead and see what preparations are necessary before heading off.

"There is still snow at the top and there are even glaciers in that area. Last night, the temperature was below zero. It was -10C, yes, really cold," he said.

Additional reporting: Helen Donohue