101.   The airline said passengers not prepared for the heightened security caused the delays.

102.   The explosion and the threats that followed caused officials to place many federal buildings throughout the nation on heightened security.

103.   The final debate the campaign will take place against the backdrop of heightened national security concerns.

104.   The foursome posed such a need for heightened security that the director of the Secret Service traveled with the Clintons on Air Force One.

105.   The Gore commission will look at who ultimately will pay for heightened security at airports over the next decade and into the next century, Pena said.

106.   The heightened security at public utilities reflects the wariness of the nation as a whole.

107.   The heightened security is, of course, understandable.

108.   The heightened security measures at public buildings went almost unnoticed Friday.

109.   The four-year project may now be disrupted because of heightened security now in place.

110.   The heightened security condition remains in effect throughout the day and a decision about the rest of the week will be made later, she said.