MILAN (AP) — A guard at a construction site near a 2026 Winter Olympic venue in the mountain resort of Cortina d’Ampezzo died during a frigid overnight shift, authorities confirmed on Saturday.

Italy’s Infrastructure Minister Matteo Salvini called for a full investigation into the circumstances of the 55-year-old worker’s death.

Italian media reported that the death occurred on Thursday while the worker was on duty at a construction site near Cortina’s ice arena.

Temperatures that night plunged to minus 12 degrees Celsius (10.4 degrees Fahrenheit.)

Milan Cortina organizers said that the worker died of a heart attack.