The death toll has risen to 76 and four people have been arrested in Turkey after a ski resort hotel caught fire in the early hours of Tuesday morning. Packed for the school holidays, 234 guests were staying in the 161-room Grand Kartal Otel in Kartalkaya when the fire broke out around 3.

At least 66 people were killed and 51 injured as a fire ripped through a ski resort hotel in northwestern Turkey on Tuesday, according to the country’s interior ministry.

In the aftermath of the incident, Turkish President Recep Tayyip Erdogan announced a day of national mourning to be observed on Wednesday. Rescue teams and local authorities are investigating the cause of the fire,