Police in the city have confirmed the victim killed is a 35-year-old tourist from the UK. The identity of the victim is not yet known. The shooting also saw another tourist injured. The nationalist of the injured tourist is yet to be confirmed by police.
The attack occurred as the tourists approached a luxury hotel in the Puerto Madero area, the Argentine news agency Telam said.
Naval officials said in a statement that assailants on a motorcycle, apparently supported by accomplices in a car, tried to steal the belongings of the tourists.
The tourists attempted to resist.
One was shot in the groin and the other was shot in the right lung.

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The second has been pronounced dead.
Police have launched an investigation to find the attackers.
The shooting happened at 11am outside the Faena Art Hotel in the Argentinian capital.
The man who died was aged 35.
The man injured is 28.
It is not yet known if the two men are known to one another.
This is a breaking news story.
More to follow…