Investigators bugged the unit's office and began monitoring their social media messages and emails after an anonymous tip off.

Detectives are also investigating an anonymous tip that a worker may have been buried on a farm, with forensic archaeologists called in to examine a plot.

They joke about the anonymous tip that launched the stakeout.

Investigators were acting on an anonymous tip, and would not say who contacted them, but that it was not a relative.

Someone gave an anonymous tip to the police that a suspicious person was painting a car to look like a police car.