71.   Kladifko continues to tighten security, add student awareness programs and review safety procedures and now believes he has the safest high school in the district.

72.   Maryland Gov. Parris Glendening also declared an emergency while Virginia Gov. Jim Gilmore tightened security and activated the Virginia Air National Guard.

73.   Meanwhile, the Senate adopted the first in what is expected to be a several measures to counter Chinese espionage and tighten security for U.S. nuclear secrets.

74.   Meanwhile, security has been tightened at federal offices around the country to prevent against any violence this weekend.

75.   Most have opted for tightening their security, though they are all too aware that art thieves are sophisticated and work so quickly that they can ignore alarm bells.

76.   Nonetheless, officials tightened security around the base.

77.   NATO peacekeeping troops tightened security around the Bosnian Serb president following threats made by supporters of her rival, wartime leader Radovan Karadzic, news services reported.

78.   Officials tightened security at airports across the nation.

79.   Officials have promised to tighten security and conduct an investigation, which may shed some light on why so many people messed up at so many levels.

80.   Once fans arrive at the ballpark, they will find security tightened.