Police questioned witnesses on Monday in their search for a man who took a hammer to a controversial photograph of a crucifix bathed in urine at an art exhibition in an Avignon museum.

The modern art museum, the Collection Lambert, in southern France, said an assailant destroyed the photograph by American artist Andres Serrano, “Immersion (Piss Christ)” on Sunday and apparently accidentally damaged another of the artist’s works while struggling with a guard.

It was not immediately clear whether the assailant was part of a demonstration a day earlier by a right-wing group denouncing the 1987 photograph as blasphemous and demanding its removal from the exhibition, entitled “I Believe in Miracles.”

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