11.   The perimeter fence keeps out predators and limits the spread of chemicals the farmers use on the surrounding area.

12.   Authorities are unsure how he got out of the perimeter fence.

13.   Because of previous incidents of rock-throwing, the peacekeepers had erected a huge burlap shield along the perimeter fence to block the departing soldiers from view.

14.   Beijing has also stepped up security at diplomatic compounds, running barbed wire along walls, blocking off streets and adding perimeter fences.

15.   Col. Gary Boyle takes a post overseeing security at Dhahran and concludes the perimeter fence is too close.

16.   Embassy buildings and staff accommodations stand well back from the perimeter fence, offering protection against truck bombings and lesser violence like stone throwing.

17.   Every school has a perimeter fence, at least one armed guard, metal detectors and a bomb shelter big enough to hold all the students.

18.   In recent months officials had reinforced their perimeter fence with waist-high concrete barriers, increased observation posts and patrols.

19.   In the last action of their long years here, a small guard unit crouched behind a perimeter fence at the port with a machine gun.

20.   It is often difficult to trim the grass near or under a perimeter fence.