Answering a phone call to learn that a tragic accident has happened and that your child is involved — this is every mom’s and dad’s worst nightmare.

That’s the horrible call many families in Humboldt, Canada, received Friday evening after a bus carrying the Humboldt Broncos of the Saskatchewan Junior Hockey League to a playoff game against the Nipawin Hawks collided with a tractor-trailer in the Saskatchewan province.

The crash occurred at about 5 p.m. local time Friday night; the exact cause is still under investigation. As of Sunday night the death toll stood at 15, with three in critical condition, according to the Royal Canadian Mounted Police. The fatalities were 10 players, two coaches, the bus driver, a team volunteer, and a broadcaster, some outlets reported.

Aidan Hughes, a hockey player from London, Ontario, tweeted after the crash, “This tragic loss of life hits too close to my heart. Give your teammate a big hug today, for the brothers that didn’t make it to their game last night.”

Parents everywhere feel the sudden and heart-wrenching loss — and mourn for the parents they will never meet who won’t be hugging their beloved children again.

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“My hope for these moms especially is their ability to hold onto the memories,” Mary Hart, whose son played high school hockey in Reading, Massachusetts, told LifeZette. “The early mornings with their sleepy heads, and the freezing moments in the rink, the hugs of both joy and consolation after the wins and losses …”

Jaxon Joseph, the 20-year-old son of former Pittsburgh Penguins player Chris Joseph, was among those killed, according to SportsNet.com.

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The tractor-trailer driver was not injured in the collision, although he was initially detained, and is not currently the subject of a criminal investigation, Royal Canadian Mounted Police Assistant Commissioner Curtis Zablocki told CNN.

Ranging in age from 16 to 21, the players on the bus hailed from different parts of Canada, the team website stated. Tributes poured in from around the world, including from Canadian Prime Minister Justin Trudeau and from the NHL.

“We sent condolence, comfort and strength to all affected by the devastating crash involving the Humboldt Broncos’ team bus,” the National Hockey League tweeted after the crash.

President Donald Trump called Prime Minister Justin Trudeau after receiving news of the crash and tweeted a message of faith and condolence shortly afterward.

The tragedy was and remains hard to handle. “Our Broncos family is in shock as we try to come to grips with our incredible loss,” Kevin Garinger, the team’s president, said in a statement on the team’s website.

Expressions of support for the families and the team poured in all weekend, and a GoFundMe fundraising campaign established to aid the families has already surpassed $4 million. A photo of three players holding hands in their hospital beds rocketed around the internet, stirring up feelings of sadness and resolve in the hockey world.

#HumboldtStrong was trending on Twitter all weekend, as players and nonplayers shared their pain.

Tasked not only with the athletic growth but also the safety of their players, coaches were hit hard by the unthinkable loss.

“I can’t imagine being the parent or the wife or the kids at home going through something like this,” Toronto Maple Leafs coach Mike Babcock said at a press conference. “It hurts.”

Deirdre Reilly is a senior editor at LifeZette.