11.  He said that vigilance about terrorists has already thwarted some planned attacks although he declined to be specific.

12.  He is convinced the anthrax episode is the latest in a series of planned attacks.

13.  He said the government has received no specific threats of planned terrorist attacks against specific U.S. targets.

14.  He said vigilance about terrorists has already thwarted some planned attacks, although he declined to be specific.

15.  In both cases no attack followed and federal officials suggested that heightened vigilance might have helped foil planned attacks.

16.  In three recent cases, planned attacks by heavily armed, threatening students were thwarted by young people who saw warning signs and reported them.

17.  Israeli media have reported that information Hamden supplied police warned about planned attacks in recent weeks against an office building in Tel Aviv and shopping malls and buses.

18.  Israeli police went on alert Sunday after receiving information pointing to a planned terrorist attack, setting up checkpoints on roads leading to and from the West Bank.

19.  It was not clear if the requests spelled out planned terrorist attacks.

20.  It was not clear if the authorities had specific information about a planned terrorist attack, or were simply showing their vigilance.