2 skiers killed in avalanche on popular Mont Blanc skiing route near French-Swiss border

Two skiers were killed and another injured Sunday when an off-trail avalanche tore through a popular freeride route on the Italian side of the Mont Blanc massif near the French-Swiss border, officials said.

Three skiers were swept up in the Sunday morning slide along the Couloir Vesses, a well-known off-piste route in Courmayeur’s upper Val Veny, according to Italy’s Alpine Rescue, The Associated Press reported.

Search and rescue operations involved 15 rescuers, three canine units and two helicopters. One victim was transported to a hospital in serious condition but later died, the agency said.

Authorities said another person was partially buried in an avalanche in Trentino but was pulled to safety by companions.

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The deadly slide comes amid a particularly dangerous stretch in the Italian Alps. Italy’s Alpine Rescue said last week that 13 backcountry skiers, climbers and hikers died in the Italian mountains in the week ending Feb. 8 – a record toll – with 10 of those deaths caused by avalanches linked to an unusually unstable snowpack.

Officials said recent storms have dumped fresh snow onto fragile underlying layers, while strong winds have created unstable drifts, producing hazardous conditions across the Alpine arc bordering France, Switzerland and Austria.

The main issue is caused by "persistent weak layers in the snowy cloak, often covered by fresh snow or wind, conditions that make detachments unpredictable and easily triggered even by the passing of a single skier or alpinist," the National Alpine and Speleological Rescue Corps said. "The dangerous points are many and difficult to identify, even for an expert."

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Federico Catania, a spokesperson for Italy’s Alpine Rescue Corps, said recent snowstorms have drawn visitors eager to take advantage of fresh slopes, "and as a result, the number of accidents, and therefore fatalities, has increased proportionally," The AP reported.

Courmayeur, a town of roughly 2,900 residents, sits about 200 kilometers – or 124 miles – northwest of Milan, a host city for the Milan-Cortina Winter Olympics.

The incidents occurred as the Winter Olympics were kicking off in the region on Feb. 6.

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Authorities stressed that competition sites – located in Lombardy near the Swiss border, Cortina d’Ampezzo in Veneto and Val di Fiemme in Trentino – remain safe, well-maintained and closely monitored.

"There is no danger for people skiing within managed ski resorts, and, in particular, no risks to the Olympic sites," Catania said previously. "All of these areas are constantly monitored and are generally safe regardless of Olympic events."

Prior to the start of the Winter Olympics, Vigili del Fuoco said crews would maintain safety measures for all visitors to the sites.

Fox News Digital’s Bonny Chu and The Associated Press contributed to this report.