Four people from Caerphilly have been arrested as part of a UK-wide operation targeting suspected paedophiles.
They were among 660 arrested as part of a six-month operation co-ordinated by the National Crime Agency.
The agency has said more than 400 children across the UK have been safeguarded.
Two 52-year-old men, a 59-year-old woman and a 60-year-old man, all from Caerphilly, were arrested and released on police bail.
A 26-year-old man and a 48-year-old woman from Caerphilly were also arrested in May but were released with no further action.
In Wales, a total of 59 people were arrested. Two were registered sex offenders.
The operation targeted people accessing indecent images of children online.
NCA Deputy Director General Phil Gormley said: “This is the first time the UK has had the capability to co-ordinate a single targeted operation of this nature. Over the past six months we have seen unprecedented levels of cooperation to deliver this result.
“Our aim was to protect children who were victims of, or might be at risk of, sexual exploitation. A child is victimised not only when they are abused and an image is taken. They are re-victimised every time that image is viewed by someone.”