51.  Hard-working agents operating under the existing constitutional safeguards uncovered the snippets of information hinting at a possible attack just fine.

52.  If the vaccine is effective, it could substantially alter the debate about how the nation should prepare for a possible attack by terrorists using smallpox.

53.  In general, the president sought to tread a fine line between reassuring Americans and telling them to be on their guard against possible future attack.

54.  In his testimony, Thompson cited the hastened production schedule as evidence the Bush administration was moving aggressively to defend against a possible biological attack.

55.  In preparation for a possible attack, Germany and Britain Monday closed their embassies in Belgrade.

56.  In preparation for a possible attack, Germany and Britain closed their embassies in Belgrade.

57.  In recent days, Israeli officials have stepped up their warnings of possible Iranian attack.

58.  In recent weeks Brazilian shares fell first on concern about a possible speculative attack on the real.

59.  Initial reports said it had detonated two land mines placed on the mountainside by the Bosnian army to defend against possible attack by Bosnian Serb rebels.

60.  It made a steep descent into the airport as a precaution against possible attack from the ground.