“I just ask for those criminals to be arrested so they do not kidnap anyone else in Sao Paulo,” Aparecida Schunck, 67, told reporters.

Three men are said to be in custody after Mrs Schunck was found, unharmed, in a house in the Sao Paulo region, having been abducted from her own home in the city.

Her daughter, marketing executive Fabiana Flosi, 38, is the wife of Briton Bernie Ecclestone, 85, one of the most powerful and wealthiest figures in world sport.

Ecclestone divorced his wife of 25 years, Croatian model Slavica Radic, in order to marry the young Brazilian. The couple lives in England.

A ransom demand of more than 30 million euros for Mrs Schunck is said not to have been paid. She was reportedly traced after phone calls made by the kidnappers were monitored by police.

One of those detained has been named as helicopter pilot Jorge Eurico da Silva Faria, who has worked for Formula One in Brazil.

Kidnapping was common in Brazil a decade ago, with several people seized each day, often for sums of just a few hundred euros.

A crackdown by police, including the formation of a special anti-kidnap division, reduced the number considerably, and the crime has become much less common.

Brazil is currently in the midst of its worst economic crisis in almost a century. (Euronews)