Five friends from Argentina who were celebrating the 30th anniversary of their graduation in New York were among those killed in Tuesday's terror attack.
The foreign ministry in Buenos Aires confirmed the deaths of the victims, who all came from the city of Rosario in central Argentina.
Eight people in total were killed during the attack, including one Belgian and two Americans.
The Argentine nationals were named as Diego Enrique Angelini, Alejandro Damián Pagnucco, Ariel Erlij, Hernán Ferruchi and Hernan Diego Mendoza.
A sixth member of the group, named as Martin Ludovico Marro, is being treated in a Manhattan hospital, the ministry added.
Four other members of the group escaped unharmed.
President Mauricio Macri tweeted: "Profoundly moved by the tragic deaths this afternoon in NY. We are at the disposal of the families of the Argentinian victims."
Belgian confirmed among the dead
A Belgian national was also confirmed among the dead by the country's prime minister.
Ann-Laure Decadt, 31, a mother-of-two, had been cycling with her mother and two sisters when she was killed.
Her husband told the New York Daily News that Ms Decadt was a "fantastic wife and the most beautiful mum".
Messages of condolence to Ms Decadt, whose sons are three and three months, were left in a tribute book in the village of Staden.
"This loss is unbearable and unthinkable," husband Alexander Naessens said in a statement.
Prime Minister Didier Reynders tweeted that he was "deeply saddened" by the news.
Two Americans also killed
Two Americans were also revealed to have been killed in Tuesday's attack.
Nicholas Cleves, a 23-year-old software engineer from New York, and 32-year-old project manager Darren Drake from New Jersey, were confirmed on Wednesday to be among the dead.