The pickup truck, which had an improvised white wooden trailer constructed over the back, was transporting them in "overcrowded and unsanitary conditions," said a state police report seen by AFP.
The agreement to open the market potentially worth $10 million a year came after US Vice President Mike Pence met this week with Argentina's president Mauricio Macri.
'The beauty that is being taken out of our cities, towns and parks will be greatly missed,' Trump says
"On the side of those who combat racism and xenophobia. Our common fight, yesterday and today. #Charlottesville," he wrote on Twitter.
Surge in heroin use, other opioids seen as main reason for increased deaths
Heather Heyer, 32, was killed in Charlottesville on Saturday when a suspected white nationalist drove his car into a crowd protesting the far-right march.
Operation against ISIL in eastern Afghanistan injures several soldiers
'This is our town and it was invaded by white supremacist terrorists,' says Shining Crawford, one of many who demonstrated
Vice President Mike Pence asks region to work with US to restore democracy in Venezuela
The drill, part of a 19-day exercise, came after a tense war of words between the United States and North Korea over Pyongyang's threats to fire missiles towards the Pacific island of Guam.
Volatility eased as traders focused on the world economy and corporate earnings after a week dominated by the dramatic spike in tensions over North Korea, which triggered a global sell-off before prices bounced back Monday.
'We cannot sit on a council for a president who tolerates bigotry and domestic terrorism,' say AFL-CIO representatives
General Joseph Dunford visits China amid tensions between U.S., North Korea over missile tests
Victims of rape, enslavement a human rights priority for the Trump administration, Tillerson says
Trump ran for the White House on a pledge to halt all Muslim immigration to the United States, and he and his supporters have themselves been accused of fostering a climate of intolerance against certain communities.
Thousands gather to protest against Trump over his response to white supremacist rally
The drill was to take place August 26 and 27.
"If they fire at the United States, it could escalate into war very quickly," Mattis told Pentagon reporters.
More than 5,000 US troops are taking part in the war against ISIL in Iraq
Undocumented immigrants locked inside for 8 - 9 hours
A young woman died and 19 people were injured in the city of Charlottesville when a car plowed into a crowd of people after a rally by Ku Klux Klan members and other white nationalists turned violent. Two state police officers died in a helicopter crash near the embattled area.