21.  People with asthma, those who are highly allergic or who suffered a previous anaphylactic attack are especially vulnerable to future anaphylaxis.

22.  Previous attacks have been separated by months, if not years, Inman said.

23.  Such a missile attack would be a frightening departure from previous terrorist attacks on airliners.

24.  That means that a portion of heart muscle had died from lack of oxygen, just as in his previous three attacks.

25.  That post was created because the intersection had been the site of several previous attacks.

26.  The market area, with its congested shopping streets, narrow alleys and dense population, has been the site of many previous terrorist attacks.

27.  The pack was riding rapidly and had caught all of many previous attacks.

28.  The same groups as in the previous attack are suspected, but to date there have been no arrests or convictions.

29.  The statement included several signs pointing toward bin Laden, who has financed and otherwise supported previous terrorist attacks on American outposts, according to U.S. officials.

30.  There was no immediate assertion of responsibility for the ambush, a drive-by shooting that bore the markings of previous attacks by Muslim militants.