1.  Ashcroft said other terrorist attacks in the United States may have been averted by placing the nation on a heightened state of alert and tightening security around potential targets.

2.  At the post office at the Oakland Federal Building, employees said they were on a heightened state of alert.

3.  Airport security, already at a heightened state of alert, was operating at full throttle at SFO.

4.  But the capital and several other cities were already in a heightened state of alert after widespread rioting by Buddhist monks in recent weeks.

5.  But soon, partly because of the emergency communications system devised after the terrorist attacks two months ago, the heightened state of alert subsided.

6.  But the capital and several other cities are already in a heightened state of alert following widespread rioting by Buddhist monks in recent weeks.

7.  Edwards Air Force Base in the Antelope Valley was placed on a heightened state of readiness, a spokesman said.

8.  Every show seemed to come accompanied by sinister, percussive music and stentorian voices designed to leave the viewer in a heightened state of agitation.

9.  Every show on Tuesday seemed to come accompanied by sinister, percussive music and stentorian voices designed to leave the viewer in a heightened state of agitation.

10.  He said American armed forces had not been placed on a heightened state of alert as a result of the accident.