Former Argentinian football player Diego Maradona was filmed slapping a journalist on the face in Buenos Aires as he was leaving an event with his family on Saturday.
Fans and members of the media had surrounded the car to take pictures when Maradona got out of it and confronted a journalist, slapping him on the face and calling him an idiot (in Spanish).
It was not immediately clear why Maradona struck the journalist, who had no instant reaction to the gesture.
Argentina has defaulted on its debt for the second time in 13 years.
Talks with creditors broke down on Wednesday night and the midnight deadline passed without a deal to avert a default.
Argentina has been isolated from international financial markets since its record $100 billion default in 2002.
Argentina is on the verge of defaulting on its debt after talks with creditors broke down.
As the clocked ticked toward a midnight (0400 GMT) deadline, economy minister Axel Kicillof stuck firmly to the government line, repeatedly denigrating the creditors as "vultures" after two days of intense negotiations.
Argentine banks scrambled to put together a proposal to buy out the non-performing debt held by hedge funds to avert a default.
But that deal collapsed, a senior banking executive and a second source from the financial market told Reuters.
"It all fell through," said the banking executive.
Argentina's FA has been fined 30,000 Swiss francs (£19,444) by Fifa after members of the national team stood with a banner claiming the Falklands as Argentine before a World Cup warm-up match.
Several players from the team that went on to lose the tournament's final to Germany stood behind the banner reading "Las Malvinas Son Argentinas" ("The Falklands are Argentine") before a friendly win against Slovenia in Buenos Aires on June 7.
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Riot police have fired tear gas and used water cannons to disperse Argentina fans who were angry at their team's World Cup final performance.
Clashes were reported in downtown Buenos Aires in the hours following the loss.
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Argentina's coach Alejandro Sabella believes Germany will have the advantage in the World Cup final.
Speaking after his team knocked the Netherlands out of the tournament 4-2 on penalties, Sabella said the fact Germany has a extra day's rest while his players faced extra time and a gruelling penalty shootout could be "crucial".
"Some of our players are sore, beaten, tired - the results of a war so to speak," he told reporters.
The match is extremely difficult ... Germany is always a difficult hurdle to overcome", Sabella added.
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