91.   Advanced warning systems have saved many lives by predicting where and when a tornado may strike.

92.   Accords on cooperation in postal services and telecommunication, customs and mutual warning systems in case of nuclear accidents are also to be signed.

93.   Aerospace Corp., a nonprofit company that develops and tests satellites for the Air Force, is building a space-debris warning system in Colorado Springs.

94.   Airlines to install new ground warning systems.

95.   An airport warning system that could have alerted officials of the danger was crippled by a software error.

96.   But no alarms wailed in the populous capital, revealing apparent flaws in the warning systems.

97.   But officials said countries remain far apart on a separate issue of providing adequate resources to respond in those cases where the warning system fails to avert a crisis.

98.   But setting up a seismic warning system in California is far more complex, experts say.

99.   But the warning system often was broken, going off randomly.

100.   But they have found that an airport warning system that might have prevented the accident was not working at the time of the crash.