1.   Staff withdrew from the main part of the prison but secured the perimeter.

2.   Nine days after the Marines seized this desert airstrip, they have started to settle in and secure the perimeter.

3.   Police secured the perimeter.

4.   Some of the troops were not following elementary military rules such as securing the perimeters of their bases, barracks and offices, one official said Friday.

5.   As the soldiers began to secure a perimeter around the area, rebels opened fire at them, Mahecha said.

6.   The Marines reportedly would secure the perimeter of the bombing range once protesters are removed.

7.   Most of the fire was not being extinguished but its perimeter was being secured to prevent it from spreading, he said.