1.   Along several border stretches, the authorities also installed steel fences, searchlights, motion detectors and video cameras.

2.   Authorities installed elaborate zig-zag mazes of concrete highway barriers on the thoroughfare as well as barriers along Lafayette Park and park land south of the White House.

3.   Because the Mexicans cannot hear, the authorities have installed special touch-sensitive lights that flash inside the rooms whenever someone knocks on the door.

4.   In Melilla, the local authorities have installed a barbed wire fence and infrared sensors by way of a border.

5.   On a recent day, someone proposed that federal authorities installed a day-care center in the Alfred P. Murrah building in Oklahoma City as a human shield.

6.   Two years ago, the housing authority installed air conditioning, which works intermittently.

7.   Authorities also were installing improved surveillance technology, whose characteristics they would not discuss.

8.   He said authorities recently installed similar cameras in police stations and jail cells in the state capital of Mexicali, where the program has been cheered by locals.

9.   In an effort to show they are willing to back down, Serbian authorities on Saturday installed an interim government in the rebellious Serbian province.

10.   Indian pilots and air traffic controllers have complained to the government that airport authorities should install long-range radar and other navigational equipment immediately.