Turkey has arrested 15 people as part of an investigation into a fire that killed 78 people and injured dozens at a ski resort in the Bolu mountains earlier this week, state media reported on Sunday.

The number of suspects detained in connection with the deadly hotel fire at a ski resort rose to 14 on Friday, President Recep Tayyip Erdogan said Friday. Erdogan also reiterated his commitment to ensuring that anyone who may have caused the blaze by prioritizing profit over safety is brought to justice.

Some had returned to the hotel year after year. Their deaths — amid dozens of others at the hotel — have stirred grief and outrage.