YOSEMITE NATIONAL PARK, Calif. -- Officials say an oak tree limb fell on a tent in the heart of Yosemite National Park killing two young campers.

Park spokesman Scott Gediman on Friday morning declined to release the ages or any details about the two, describing them only as under age 18.

Gediman says the limb fell from a black oak tree at about 5 a.m. Friday in the popular Upper Pines Campground in Yosemite Valley. The juveniles were sleeping in their tent when an oak tree limb fell and hit them, reports CBS Sacramento.

Get Breaking News Delivered to Your Inbox

The incident happened in the Upper Pines Campground, according to Yosemite National Park.

Park rangers, who soon showed up at the scene found that the children had died, reports CBS Sacramento.

Gediman said the campground is one of the most popular with a view of Half Dome.

The incident remains under investigation

In 2012, a parks concession employee died when his tent cabin was hit by a falling limb.