There are five housing units within the secure perimeter, including the original two-tiered structure.

A hashtag is not a secure perimeter, after all!

"I don't think he'd been outside a secure perimeter before," the prince said quietly.

Minimum-Security inmates are housed in two structures outside the secure perimeter.

A new female facility has been constructed in the precincts outside the male section within its very own secure perimeter.

Their priority is to establish a secure perimeter.

We mustn't meet again until we have armed ourselves and established secure perimeters.

Some of the 100 "interim" spaces, actually trailers within a secure perimeter, will be used to house women.

Meanwhile, the troops had established a secure perimeter and systematically begun to extend their control into the countryside beyond it.

The site consists of a large group of office blocks within a secure perimeter.