Arrests follow discovery on Friday of magistrate and her mother in a garage in south-east of country

French authorities have arrested six suspects, including a child, after a magistrate and her mother were held captive last week for about 30 hours in a cryptocurrency ransom plot.

Four men and one woman were detained, three overnight and two on Sunday morning, the Lyon prosecutor Thierry Dran told Agence France-Presse. He later confirmed a child had been arrested on Sunday afternoon.