On one of the screens they have spotted an intruder near the perimeter fence.
Plans are also afoot, according to Patton, to install an expensive high-tech electric perimeter fence with an intruder alarm.
Several times they evaded the police and occupied areas near a specially built perimeter fence.
Six Romanians, five Moldovans and one from the Czech Republic scaled the perimeter fence and fled at about 2100 BST.
The plane slammed into a TAM airlines building after narrowly clearing the airport's perimeter fence and rush-hour traffic on a surrounding highway.
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The US Coast Guard has now established a security zone in the waters around the base, and the perimeter fence has been strengthened.
Friday when he jumped out of the rail car, "clearing the exhibit's perimeter fence" and landing in the den, according to Bronx Zoo Director Jim Breheny.
Wreckage could be seen flying over the perimeter fence, and striking a car in front, and footage of the incident was widely used in news media.
The BBC's Clinton Rogers estimated that 50 protesters had been on site and he said he had seen "a handful" over the other side of the perimeter fence.
Authorities said then that eight masked, heavily armed men in clothing resembling police uniforms had burst through a hole in the perimeter fence onto the airport tarmac in two vehicles.
Prison officials also have been bugged by rumors that the penitentiary was not entirely safe and secure, and that the lack of adequate staffing and a perimeter fence were potential problems to the community.
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The "cells" have a chain-link fence perimeter, a concrete floor and a wooden roof but are otherwise open to the elements.
Guards, walking two abreast, patrolled the perimeter of the fence.
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