Mont Blanc is the highest mountain in Europe at 4,810 meters.
CNN  — 

Conquering Western Europe’s highest peak is an ambition shared by many climbers, but one Mont Blanc summit attempt cut some serious corners en route to the top.

Rather than scaling the 4,810 meters (15,781 feet) under their own steam, a pair of would-be climbers landed a small plane on the face of the mountain on Tuesday.

Officers from France’s National Gendarmerie stopped the pair, who were equipped with climbing equipment including ropes and crampons, a spokesman told CNN via telephone.

While the pair were not arrested, their details were recorded and an investigation has been opened, another spokesman said.

Officers are looking into what offenses may have been committed, but this will take some time given that it is such an “unusual” case in an area covered by “very specific” regulations, he added.

Local authorities from the nearby ski resort of Chamonix criticized the illegal landing in a statement posted on Facebook.

“It constitutes an intolerable attack on the high mountain environment and on all existing protective measures,” Eric Fournier, mayor of Chamonix-Mont Blanc, said in the statement.

Fournier praised the police response and said he hoped their actions would dissuade anyone else from engaging in a similar “provocation.”

The climbers, both of whom are from Switzerland, landed the plane less than 400 meters from the top of the mountain, according to AFP.

Local authorities are struggling to deal with huge numbers of visitors to the mountain and recently introduced new rules designed to limit overcrowding.

Climbers scaling Mont Blanc without having booked a room in one of its shelters could now face two years in prison and a €300,000 ($336,000) fine.

Authorities said “huge visitor numbers” on the mountain had led to concerns over “sanitary risks” like water availability and waste disposal problems.

The ban came into effect on June 1 and will remain in place throughout the busy summer climbing season, according to a decree signed by France’s Haute-Savoie prefecture.

An earlier version of this story misstated the action taken by the gendarmerie. This has been corrected. The gendarmerie also clarified which branch of the force was involved.