Several people from Fast’s crew had to be rescued in the Swiss Alps.

Fast himself remains missing.

“We’ve always known it was a risk,” his sister, Molly Fast, told Denver’s ABC affiliate. “He had injuries before, but we didn’t expect him to … potentially go off a cliff.”

After a days-long search, Swiss authorities canceled rescue efforts amid whiteout conditions made it hard for helicopters to fly, according to a Fox affiliate, and ground crews could do little to cover the vast and vicious terrain.

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A police spokesman, Christoph Gnaegi, told the Associated Press on Tuesday that extensive measures had been taken to find Fast, but that “the active search has now been suspended” due to dangerous conditions.

Fast’s family and friends frantically took over the mission, raising nearly $50,000 to pay for a private search team that sent helicopters and drones into the air to see where he could be trapped.

“Because he was wearing a beacon that didn’t pick up a signal and his last cell phone coordinates were near the top of the jump, we think he got stuck in a crevasse right after the jump,” the Harrison Fast Rescue group wrote Tuesday on Facebook. “We have been looking at the top of the glacier where all those crevasses and cracks are. It is really gnarly and dangerous area.

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“Since we don’t know exactly where he is it’s too difficult and risky to start looking in there on foot. Glaciers move and ice breaks.”

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In the predawn hours Wednesday morning, the group said that friends were “on the ground” preparing for a drone-based search and hoping and praying for “decent visibility with weather.”

By late morning, the group said Fast’s mother had joined the search.

Fast’s friends and family posted a photo on the website showing a dense snowy slab with a haunting caption: “Here is where we believe Harrison is.”

Here is where we believe Harrison is. Posted by Harrison Fast Rescue on Tuesday, March 29, 2016

“They have returned and viewed the footage,” the group later wrote about Wednesday’s drone search. “Drone is working well.”

Fast once talked in a video about his love for the extreme sport.

“The sport of speed flying involves small, high-performance paraglider,” he said. “Speed flying is a natural progression from mountaineering. With mountaineering, you’re hiking, you’re climbing, you’re skiing — sometimes suffering — to reach the top. When you’re up on that peak and you’ve had your look around, it’s time to do it all over again — in reverse.

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“Now with speed flying, the summit is just the beginning.”

Fast’s Facebook page is filled with photos that chronicle his adventures.

Earlier this month, Fast talked about a trip to Courmayeur, a town in northern Italy, and was soon posting photos and talking about his time in Italy and France.

“We flew from Italy back into France and then skied down the Mer Du Glace (Sea of Ice) Glacier into Chamonix,” he wrote.

A day later, he said: “I don’t want to leave. Ever.”

“Today we flew Valle Blanche, exploring the Aiguille Du Midi zone, snaking tourist’s lines on our speedwings, then playing tourist around town,” he wrote. “I was looking fresh (and getting a lot of fresh looks) in my Shinesty onesie. This zone is unreal.”

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Fast’s last Facebook post came Friday, after he arrived in Switzerland.

“Rainy day in the Valley. Rain here means pow up there!” he wrote. “I might actually ski a day of this euro vacation! The view from the hotel is beautiful. Out my window the Staubbach falls drop some 297m from the cliff edge above.”

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Friends said when the storm moved in Saturday, the gang got split up.

Swiss authorities told the Fox station that most of Fast’s friends were able to ski or hike from the downdraft.

“Another one or two that were separated from the group were found later by helicopter rescue,” Fast’s brother-in-law, John Solis, told the ABC affiliate. “Harrison is still out there right now. ”

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Fast graduated from the University of Colorado in Boulder in 2011 and now works as a mechanical engineer for RealD, which provides 3D technology, according to his LinkedIn page.

“He has been living his dream,” Solis told the ABC station.

He told the Fox affiliate that he is still hoping for the best for his brother-in-law.

“I don’t really go to that place where bad things live, if you will,” Solis said. “I keep joking with the family that he’s in some mountain-side bar, talking to a girl with a dead cellphone, not knowing what we are all going through.”