BBC News
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image captionPolice arrested Danudetch "Nene" Saengkaew after raiding his agency
Thai police have arrested the head of a child modelling agency after more than 500,000 indecent images of children were found on computer hard drives.
Danudetch "Nene" Saengkaew, 23, has been charged with child sexual abuse and downloading child abuse images.
Investigators say the images were found in a raid on the Nene Modelling Agency, north of the capital Bangkok.
The raid was the culmination of a months-long operation that began with a tip-off from Australian police.
The FBI and New Zealand police were also involved in the investigation, officials said, along with Operation Underground Railroad - a non-profit group that helps governments rescue sex trafficking victims.