At least 66 people have been killed in a fire that engulfed a popular Turkish ski resort hotel, leaving some to jump out of windows.

The fire broke out at the 12-storey Grand Kartal Hotel at 03:27 local time (00:27 GMT) during a busy holiday period when 234 people were staying there.

An initial toll of 10 dead was raised significantly in the hours after the fire by Turkey's interior ministry. At least two people died after trying to jump to safety.

It took 12 hours for the fire to be put out. Four people have been arrested, including the owner, the justice minister says.

"Our pain is great," Interior Minister Ali Yerlikaya said.

Footage circulating in Turkey showed linen hanging from windows which was used by those trying to escape the burning building.

Ski instructor Necmi Kepcetutan told the BBC he was on the second floor of the hotel when the fire broke out and managed to get out via the ski room. He then helped with relief efforts.

Eyewitnesses said the family that owned the hotel had been there at the time of the fire and Mr Kepcetutan said he saw some of the family outside.

The cause of the fire has not yet been found, but Bolu governor Abdulaziz Aydin said initial reports suggested it had broken out in the restaurant section of the hotel's fourth floor and spread to the floors above.

Aydin said the distance between the hotel, in Kartalkaya, and the centre of Bolu, paired with the freezing weather conditions, meant it took more than an hour for fire engines to arrive. Emergency services sent 267 workers to the site.

The hotel was investigating whether guests, including children, were trapped in their rooms as the fire spread.

The hotel had two fire escapes, according to the interior minister, and one hotel worker said they had managed to rescue 30-35 people.

Justice Minister Yilmaz Tunc said prosecutors had been allocated to investigate the blaze.

The hotel was last inspected in 2024, and the tourism minister said there had been no concerns regarding the hotel's fire safety prior to Tuesday's disaster.

The Bolu mountains are popular with skiers from Istanbul and the capital Ankara and the hotel was operating at high occupancy at the start of two-week school holidays.

The north-western town is about 170km (105 miles) from Ankara.

Although the fire was confined to one hotel, the governor told Turkish media that a neighbouring hotel was evacuated as a precaution.

Guests evacuated from the hotel were taken to hotels closer to the centre of Bolu.