Some 76 people have been arrested during 48 hours of raids as part of an operation targeting suspected internet paedophiles.
A Scout leader, a retired teacher and members of the Armed Services were among those detained by officers from more than 40 police forces, who executed more than 141 search warrants in the operation led by the Child Exploitation and Online Protection Centre (Ceop).
Most of the warrants related to image offences, including the possession and distribution of indecent images of children, Ceop said.
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The move, which had been expected, was made on the recommendation of FBI disciplinary officials.
The voicemail left on a landline was not heard by a state DoT employee until Friday.
Officers were called to the house at 7.43pm on Friday, and a 35-year-old man was arrested on suspicion of murder two hours later.