Bearded Paul Barry Clark, believed to be in his 70s, was arrested on Saturday on suspicion of raping a nine-year-old boy.
|Ex-Kiwi Paul Clark|
The mother of the first victim called police after her son told her he had been given pocket money by Clark after being abused by him.
The boy is also said to have named yet more children he said were abused, including one aged just six.
Clark is said to have committed crimes in Campo Grande, a poor, distant suburb of Rio de Janeiro many kilometres from the city's picture-postcard beaches.
The case is being investigated by officers from the local Civil Police force. In Brazil, the Civil Police employ detectives while the Military Police provide frontline officers.
After his arrest, officers seized a camera and computer from his home, which were said to contain photos and videos of minors.
Child sex abuse, including by foreign tourists and expats, is a significant problem in Brazil, especially in the poorer North-East and Amazon regions where desperate poverty and corrupt public officials allow paedophiles to operate with impunity.
New Zealand-born Fire-fighter Pleads Guilty to Child Porn Charges in NSW
A New Zealand-born firefighter who was honoured for his work during the fatal Queensland floods in 2012 has pleaded guilty to charges of sexually exploiting children and could face up to 15 years in jail.
|Banora Point, NSW|
Under the pseudonym "Tommyfun1"' Gillespie started downloading thousands of images from users of the file sharing website GigaTribe, including videos of child abuse.
A former member of the New South Wales fire brigade in Banora Point on the state's northern coast, Gillespie, 31, admitted he downloaded and disseminated the material after two laptops and a mobile phone were seized by police.
Gillespie, who also runs a lawn-mowing business resigned from his on-call job with the fire service in December.
Police allege Gillespie told the discussion forum he liked pre-teens and shared his password with another user to access 83 files on his account, a number of which contained child abuse material.
Gillespie last month pleaded guilty to all six charges relating to the downloading, promotion and possession of child abuse material.
Until he is sentenced in the Tweed Heads Magistrates Court later this year Gillespie has been ordered to live at his parents house and have no contact with children aged under 16.