The group was traveling in a rental car near Stockholm when they crashed through a barrier set up to stop vehicles from crossing an opening drawbridge. The car plunged more than 80 feet into a canal, killing Kris Leonard, River Reeves, Tomas Lowe and Jack Dakin, according to the AP. All the men were aged between 19 and 32.
The fifth man was the band's manager, Craig Tarry, his family confirmed through a statement issued Sunday through Britain's Foreign Office.
"Craig was a warm, loving person who had worked tirelessly to achieve success and follow his dreams within the music industry," the statement said.
The Warrington-based group was in Sweden to perform at the Where is the Music? festival on Friday, according to the BBC. They had a concert scheduled back in England on Saturday, in the town of Guildford in Surrey.
Swedish police told the BBC that the victims' bodies were discovered by divers, and are unsure why the group drove through the barrier.
In addition to flashing lights and warning signs that signal when the bridge is rising, authorities said that several other drivers were stopped behind the barrier.
"The witnesses just saw a car beside them and kind of disappear," Inspector Martin Bergholm told the BBC.
A spokeswoman for the U.K.'s Foreign Office told CNN that British officials were "in contact with Swedish authorities and supporting the families at this very difficult time."
Several other indie bands have since taken to social media to pay tribute to the up-and-coming group.
"Our deepest sympathy to the family's and friends of #ViolaBeach today. So so sad. Our thoughts and prayers are with you," wrote The Script.
Our deepest sympathy to the family's and friends of #ViolaBeach today. So so sad. Our thoughts and prayers are with you. M— the script (@thescript) February 14, 2016
Our hearts go out to the families and friends of @Viola_Beach. So sad x— KasabianHQ (@KasabianHQ) February 14, 2016
Heartbreaking news about @Viola_Beach, sending our thoughts to their friends and family— Rudimental (@RudimentalUk) February 14, 2016
"River had such talent and such humility, such charm and such innocence it seems so unfair that he can be taken so cruelly from us like this," Reeves family said in a statement to the BBC, Sunday.
Added the group's producer Ian Grimble, "It is with great sadness that we will not be able to see them grow from the spark that they are now, into the raging fire that they so desperately desired to become."