21.   Monday morning, the Jerusalem police added their own security alert.

22.   No matter whether you are running UNIX, Linux, Windows, or MacOS, be sure to check the Web for security alerts.

23.   Officials declined to say how long the heightened security alert would last beyond the holidays.

24.   Since the Aden bombing, U.S. forces in the area have been on heightened security alert.

25.   The events prompted an all-out security alert, with helicopters overhead and the White House grounds crawling with SWAT teams and Secret Service agents.

26.   The Jerusalem police added their own security alert for Israelis.

27.   The nervousness was made worse by bomb scares and other security alerts at several places across Manhattan, including one late Wednesday night at the Empire State Building.

28.   The officials said they hoped other countries would help find or provide more information about the people identified in the security alert.

29.   The raid and supposed terrorist plot have electrified New York City and put it on a heightened security alert.

30.   The system will then seek confirmation from various government data bases that there are no security alerts for the traveler.