Two pairs of newlyweds, four sisters from one family and two brothers from another were among the 20 victims when a stretch limousine taking passengers to a surprise birthday party crashed in New York.
US authorities have described Saturday's accident as the deadliest domestic transport crash in nearly a decade.
Officials had not officially released the victims' names, but some details were disclosed by media accounts from relatives and Go Fund Me pages on the internet.
Erin and Shane McGowan were just starting a life together after five months of marriage, the Times Union of Rochester, New York reported.
The McGowans were a part of a party of 17 young adults who climbed into a stretch limousine 2001 Ford Excursion to celebrate their friend Amy Steenburg's 30th birthday, the paper and other media reported.
They were headed to an upstate New York brewery, but never made it, officials said.
The limo charged through a highway intersection without stopping on Saturday afternoon, in Schoharie, New York, police and the National Transportation Safety Board (NTSB) said.
It crashed into an unoccupied parked car and hit two pedestrians before coming to a rest in a shallow ravine.
The limo driver, all 17 passengers and the two pedestrians died, state police and the NTSB said.
Amy Steenburg was also a newlywed. She and her three sisters - Mary Dyson, Allison King and Abby Jackson - and her husband Axel Steenburg and his brother, Rich Steenburg, all died, relatives told The New York Times.
Barbara Douglas, the aunt of the sisters, said the victims were smart, beautiful and lived life to the fullest.
"I don't know how you say it. You can't wrap you head around such a tragedy where you have four of your daughters die," she told reporters at the scene.
NBC news reported that Mary Dyson's husband Rob Dyson also died.
It was the deadliest transportation accident in the United States since a 2009 plane crash in Buffalo, New York, that killed 49 people, NTSB chairman Robert Sumwalt told a news conference on Sunday.
