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WASHINGTON, March 19: The United States issued a worldwide caution on Friday, reminding Americans that Al Qaeda planned to use both conventional and non-conventional weapons against them.
The US government also did not rule out the possibility that "Al Qaeda will attempt a catastrophic attack within the United States".
"The US citizens are cautioned to maintain a high level of vigilance, to remain alert and to take appropriate steps to increase their security awareness," the caution said.
