DENVER -- Park rangers said someone made an illegal base jump off 14,000-foot Longs Peak Wednesday morning.

BASE jumping is illegal in Rocky Mountain National Park, reported the Fort Collins Coloradoan. It’s a kind of extreme sport where instead of using an airplane, the skydiver will jump off a mountain or even very tall buildings and towers.

The jumper only has a few seconds to deploy the chute before crashing into the Earth.

RMNP spokeswoman Kyle Patterson told the Coloradoan the jumper was spotted around 9 a.m. jumping from the east side Diamond face.

A nearby ranger was dispatched to investigate.

"It’s very rare, and we’re only aware of one other time it’s occurred in the last 10 years," Patterson told the Coloradoan.