1.   At dusk they established a perimeter along the irrigation ditch just outside Thuan Yen.

2.   Both the Shrine Auditorium and the Dorothy Chandler Pavilion, the most recent Oscar venues, had plenty of open space around them to establish security perimeters.

3.   A three-mile perimeter has been established around the debris field, officials said.

4.   Guards take on pass-rushers right at the line of scrimmage, but a tackle must back up to establish the perimeter of the pocket.

5.   We could try to establish a perimeter within airports where everyone is searched.

6.   A security perimeter will be established around the Staples Center during the convention, but downtown will not be sealed off and become an armed encampment, Kalish said.

7.   After establishing a perimeter, the officers went house to house asking who wanted to leave.

8.   Officials scattered dispersants and established a perimeter of floating containment buoys.