Caleb Moore, 25, the snowmobiler and Winter X Games superstar, remains in critical condition after his vehicle fell on top of him in a crash Thursday at the Winter X Games in Aspen, Colo.

“The Moores want to express their gratitude to all of Caleb’s fans, friends and family for their strong support and ask for continued prayers in the coming days,” read a statement apprising the public of Moore's condition by a family spokesperson to ABC News.

Moore had been attempting to complete a backflip during the Snowmobile Freestyle finals when he came up short. The skis on his sled slammed into the landing, causing the machine to flip over and eventually crash on top of him. He tumbled down the slope for several feet before coming to a stop at the bottom, where he lay for several minutes.

Moore was able to walk off of the course with help and was rushed to nearby Aspen Valley Hospital with a concussion, according to an X Games medical report. It was there that doctors discovered bleeding around his heart and Moore was subsequently flown to St. Mary’s Hospital in Grand Junction, Colo.

Moore underwent emergency heart surgery Friday and continues to remain in intensive care. “His cardiac injury has led to a secondary complication involving his brain," said Moore’s family in a statement released through ESPN on Sunday.

Caleb is the brother of Colton Moore, 23, also a decorated snowmobiler. He also suffered a crash related injury over the weekend, and was taken to the hospital for a separated pelvis.

Here's the video of Moore's crash:

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