Turkey has detained nine people as part of an investigation into a fire that killed 76 people and injured dozens at a ski resort in the Bolu mountains, authorities said.

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.

ANKARA — As the death toll from an overnight fire at a popular ski resort in northwest Turkey rises to 66, Turkish President Recep Tayyip Erdogan said on Tuesday that the country will observe a day of national mourning on Wednesday.

Anger was growing in Turkey on Wednesday as allegations piled up that negligence played a role in the deaths of 79 people who perished when a huge fire swept through