21.   But along with reduced schedules, airlines are dealing with heightened security.

22.   But heightened security because of Elian has forced dog owners to keep their pets on a leash and use only a roped-off part of the lawn.

23.   But the stalling economy and now the cost of heightened security have wiped out nearly all that the seaport and airport contribute to the city budget.

24.   But those same officials conceded that the heightened security diverted Coast Guard workers from many of their routine safety, drug and environmental protection duties.

25.   But to now pretend there is a heightened security threat in Asia is perhaps to resort to the old bugaboos.

26.   But what really excites Creatura is news that Stamps.com is developing cutting-edge technology to track mail, useful in an era of heightened security.

27.   Clinton made no mention of that in his remarks on Wednesday, instead emphasizing the heightened security measures.

28.   Despite discovery of a terrorist plan to bomb the U.S. Embassy, signs of heightened security are not overwhelming.

29.   Donald Ornick, a risk assessment expert from the Energy Department, will also help the Library develop a risk assessment plan and strategy for heightened security measures.

30.   Despite having to practice and play the game amid heightened security, the players still managed to maintain their concentration, convincing Accorsi that Super Bowl XXXVI was special.