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.

ANKARA — As the death toll from an overnight fire at a popular ski resort in northwest Turkey rises to 76, Turkish President Recep Tayyip Erdogan said on Tuesday that the country will observe a day of national mourning on Wednesday.

A fire raged through a 12-story hotel at a popular ski resort in northwestern Turkey early Tuesday during a school holiday, killing at least 76 people — at least two of them when they jumped from the building to escape the flames,

The death toll from a fire that raged through a hotel at a ski resort in northwestern Turkey on Tuesday has risen to 76, Interior Minister Ali Yerlikaya said.

Witnesses have described standing helplessly and paralyzed by the horror of people screaming for help or jumping out of windows as flames tore through a 12-story hotel at a popular ski resort

Some had returned to the hotel year after year. Their deaths have stirred grief and outrage. By Ben Hubbard and Safak Timur Reporting from Istanbul The first indication that tragedy had stricken their loved ones came around 5:30 a.