Rival Argentine union groups marred a ceremony to bury former President Juan Peron for the third time since his death in 1974.
Violence erupted hours after thousands of Argentines packed the streets of Buenos Aires to pay tribute to Mr Peron - famous throughout the world for his marriage to "Evita".
Unions and leaders of the Peronist party were behind the move, aiming to make his burial place more befitting one of the country's leading historical figures. They said Mr Peron wanted to be buried at his retreat and they hope one day to inter his wife Eva alongside.
But as supporters awaited the arrival of the body, dozens of union activists hurled rocks at each other, unleashing scattered clashes. Television images showed at least one man firing a gun in brawls sparked the refusal to allow workers in to the estate, local television reports said. They said at least 40 people were hurt.
President Nestor Kirchner cancelled an appearance after the fighting flared.
Authorities continued with the burial ceremony as clashes continued outside the compound. Mr Peron's coffin was eventually reburied, but hundreds of people left the grounds near the $1.3 million mausoleum in the Buenos Aires suburb of San Vicente before the ceremony began.
The violence added more drama to the saga involving Peron's corpse, which has been disinterred, mutilated by thieves who sawed off his hands and was the focus of a lengthy battle by a woman claiming to be his illegitimate daughter.
Worried about feverish support among his followers, Argentina's military leaders ordered Peron's coffin removed in the 1970s from the presidential grounds and banished to his family's more modest crypt.
The burial was intended to cap a day of ceremonies infused with political symbolism ahead of next year's presidential elections.