13 December 2012
Last updated at 09:30
Demonstrators in Argentina took to the streets to express their outrage after the acquittal on Tuesday of 13 people accused of kidnapping and forcing a young woman, Marita Veron, into prostitution 10 years ago. Here a woman with a T-shirt reading "We are not your prostitutes," stands in front of police in Buenos Aires.
The trial took place in the northern province of Tucuman, so the focus of the demonstration in Buenos Aires was the regional government's offices. "We are all Marita," reads this graffitti.
At the centre of the case was Marita's mother, Susana Trimarco, who has spent the past decade searching for her. She infiltrated trafficking gangs and her efforts have helped to free hundreds of women from sexual exploitation and human trafficking.
Demonstrators were angry at the verdict which they believed was a setback to combat sex-trafficking. In Buenos Aires, the protest began peacefully but turned ugly as demonstrators threw rocks.
Riot police were deployed, responding with batons and pepper spray.
The anger at the verdict was countered by the judges who said there had been no evidence linking the accused to Marita's disappearance nor that she had been the victim of human-trafficking. All those on trial had insisted on their innocence.
Susana Trimarco, seen here with Marita and granddaughter Micaela, has vowed never to abandon the search for her daughter.