A video has emerged showing the five Argentinian victims of the New York terror attack smiling and jubilant as they ride along the bike path - unaware of the horror that would soon greet them.
The video, which appeared on Argentina's La Nacion website, appears to have been filmed by Ariel Benvenuto, who survived the attack.
Benvenuto captures each of the men, riding in single file on their rented Citi Bikes as they smile and laugh for the camera. Friends for decades, they are clearly revelling in their first trip to New York as they cycle in the sunshine along New York's Hudson River.
Benvenuto ends the 40-second long video, grinning into the camera, saying: "Muy muy bueno" (very, very good).
The group was in New York to celebrate the 30th anniversary of their high school graduation had been planning the trip for many years.
The men, most of them married with young children, had travelled to the US from Rosario, a city about 320 kilometres from the capital of Buenos Aires.
As they pedalled along the bike path, terror suspect Sayfullo Saipov was making his way into the city, preparing to wreak havoc on pedestrians and cyclists enjoying a beautiful, crisp autumn day.
After Saipov entered the bike path, he drove 17 blocks, running down pedestrians and cyclists - victims' bodies, together with mangled bicycles and belongings proof of the 29-year-old's trail of terror.
Cecilia Piedrabuena, the wife of Ariel Benvenuto who survived, told Rosario's Radio LT8 her husband had been riding behind the others when "he felt something go past by him."
"He saw [the attacker's van] veer toward five of his friends," Piedrabuena told the radio station.
"He said it was going at more than 150km/h ??? terrible."
The suspect's rampage ended when he was shot by a police officer in the abdomen. He remained in hospital on Wednesday night.
He was charged in federal court on Wednesday with acting on behalf of the militant group Islamic State.
The 10-page complaint said Saipov waived his rights to remain silent and avoid self-incrimination in agreeing to speak to investigators without an attorney present from his Bellvue Hospital Centre bed in Manhattan.
The five Argentine nationals killed were Hern??n Diego Mendoza, Diego Enrique Angelini, Alejandro Dami??n Pagnucco, Ariel Erlij and Hern??n Ferruchi. The New York Police Department said all of the men were 47, except for Erlij, who was 48.
The Washington Post reported that it was Erlij, a successful businessman who had organised the reunion trip and he paid for those who couldn't afford it, according to Mary Bensuley, a long-time family friend. Erlij owned Ivanar, an iron and steel works company.
"They're great people. They have a good economic position, and they were always offering to help," Bensuley told The Post.
She described Erlij's family as "devastated". He is survived by his wife and three children.
On Wednesday, Bensuley said many locals were having difficulty understanding the motivation for such an attack.
"Here, everyone lives in peace, and religion has never been a big subject of conversation," she said in a Facebook message.
The others killed in the attack were American and Belgian, said police, who identified those victims as Darren Drake, 32, of New Jersey; Nicholas Cleves, 23, of New York; and Anne Laure Decadt, 31, of Belgium.