The government officials provide warnings for the days ahead, he explained.
These sets provided from 30-60 minutes early warning of an attack.
We do not think that the American army provides warnings of this kind without good reason.
We must have better information providing earlier warning of risks to our national security.
But he said the chemical companies knew about those conditions and did not provide adequate warning.
"There are also people who sometimes provide early warnings," Anna went on.
But that system was of an early vintage and probably provided little warning, if any, experts say.
A patrol was then sent to determine the track and also provide early warning.
In the meantime, the government will not be able to provide adequate warning about the next attack.
Such detection will provide earlier warnings of potential power failures.