11.   Federal and local law enforcement officials, meanwhile, continue to study ways to prevent terrorism.

12.   If Arafat does not change his mind and prevent terrorism, Gilad said, he may no longer remain where he is.

13.   Japanese political leaders, city mayors, and victims of the subway attack applauded the proposed legislation Tuesday as a necessary step to prevent terrorism.

14.   Now law enforcement sees the public as an integral part of its team helping to prevent terrorism or at least help catch perpetrators afterward.

15.   Palestinian neighborhoods are sometimes blockaded by Israeli troops, sent to prevent terrorism, the army says.

16.   Security experts say the U.S. inspection campaign, however broad-based it may become, is only a small step in the very large effort to prevent terrorism.

17.   State-of-the-art devices to prevent terrorism in the air have not yet assured perfection.

18.   Supporters said the measure would help prevent terrorism.

19.   The effort to prevent terrorism also grew on Monday in another corner of the globe.

20.   The finger of blame has been pointed at Yasser Arafat for not preventing terrorism.