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UK police have arrested 660 suspected pedophiles -- including doctors, teachers and scout leaders -- in a six-month operation spanning the country, the National Crime Agency said Wednesday, according to CNN. 

The operation -- which targeted people accessing indecent images of children online -- involved 45 police forces across England, Wales, Scotland and Northern Ireland.

More than 400 children across the United Kingdom have been protected from harm as a result, the National Crime Agency said in a statement.

Thirty-nine of the suspects were registered sex offenders, the statement said, meaning the vast majority were not previously known to police. Their number also included social care workers and former police officers.

The operation was kept under wraps until Wednesday to protect children and gather evidence against the accused, the statement said.

The National Crime Agency is not revealing the methods used to track down the suspects because it hopes to deploy them again in the future.

The charges brought so far range from possession of indecent images of children to serious sexual assault, it said. Many suspects have yet to be charged in the case.

"This is the first time the UK has had the capability to coordinate a single targeted operation of this nature," said Phil Gormley, the agency's deputy director general.

"Our aim was to protect children who were victims of, or might be at risk of, sexual exploitation. A child is victimized not only when they are abused and an image is taken. They are re-victimized every time that image is viewed by someone."

Some of those who start by looking at indecent images online go on to abuse children directly, he said, so arresting them now may prevent them from crossing that line.