21.   Gendarmes and firemen returning from the rescue scene Wednesday said nothing could have been done to prevent the tragedy.

22.   Hammer says the best way to prevent such tragedies is education.

23.   Growing collaboration between the intelligence and justice departments of European countries could help prevent such tragedies, he said.

24.   However, she supported the Clinton administration contention that one of the long-range answers to prevent such tragedies is for Congress to enact federal restrictions on handguns.

25.   Initially, the impression was that NASCAR had done nothing, and was going to do nothing, to prevent similar tragedies.

26.   It is always easier to assign blame after the fact than to prevent tragedies before they occur.

27.   It got grant money for more police officers on campus and urged students to listen for clues to prevent such tragedies.

28.   Many feel their arrests would have prevented the tragedies of Kosovo from occurring in the first place.

29.   No one does, or no one did, when Clinton called for extensive new security measures in the hope of preventing similar tragedies in the future.

30.   NIOSH officials said the suggestions, which call for improved equipment and better preparation, are designed to prevent similar tragedies in the future.