secret observation

See: espionage
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The haul remained under secret observation by investigators, who watched to see who came to pick up the illicit container.
The haul was then left and remained under secret observation by investigators who watched to see who came to pick up the illicit container.
"The whole Pc Salt affair and the subsequent cover-up left a bitter taste which has not been forgotten by a lot of people who were affected at the time.'' Pc Salt left his secret observation post to go drinking at a pub with colleague Pc Mark Berry before he died.
He had been watched for hours by a secret observation team who called in the hit.
In an interview, Harry had earlier told how the secret observation of the Taliban was the key to winning the battle against them.
Secret observation of a person, group or nation -- yes, spying -- has been going on since time immemorial.
A secret observation written in a diary describing the 1854 collapse of a great suspension bridge over the Ohio River in a windstorm draws a parallel to some of the food industry's past misfortunes: "Lunging like a ship in a storm, the deck rose to nearly the height of the towers, then fell, and twisted and writhed, and was dashed almost bottom upward."
During 2007, he said, there had been a number of complaints from addresses on the defendant's walk about not receiving mail and in December last year he was kept under secret observation.
The warder had been under secret observation for six weeks
The 28-year-old fled to Spain after jumping from an upstairs bedroom window when police raided one of the gang's crack factories in City Road, Anfield, after hours of secret observation.
During 2007 there had been a number of complaints from addresses on the defendant's walk about not receiving mail and in December last year he was kept under secret observation.
The "perfectly ordinary" semi-detached property in Erdington was kept under secret observation by police who saw a steady flow of clients, the Birmingham Crown Court heard.