Unsettling surveillance footage shows a tourist plane slam into the ground nose-first in the French Alps in a crash that left three people dead.

Officials have confirmed that two women and a man lost their lives in the crash occurring near Chambéry Airport in Voglans, located in the Savoie prefecture, just before 11 a.m. local time. Witnesses reported seeing the aircraft drifting sideways above the Leysse River for a few minutes prior to its rapid fall.

“We heard a huge noise that was nothing like that of a normal plane, then it crashed,” a local resident said, according to Express.

A response team of over 20 firefighters from the Savoie departmental fire and rescue service, along with SAMU (emergency medical services), the Chambéry air transport gendarmerie brigade, and units from the national gendarmerie group, were present at the scene.

Savoie officials said the exact cause of the accident was not yet known and that an investigation is being conducted.

Chambéry Airport is a small international airport near Chambéry, not far from the Tarentaise Valley and some of France’s most popular ski resorts like Meribel and Courchevel.

Just four days ago, a small propeller plane originating in Germany crashed in the Austrian Alps, killing all four people on board, authorities said. The cause of that crash was also not immediately known.