U.S. government terror warnings to local police and citizens fail to give the specific information many authorities say is needed to protect the public, a report made for Congress said Monday.
...
"When the government gives warnings without more information about why they're giving them ... that inevitably leads to people questioning whether
the timing is a diversion, or
politically motivated," said Randall Yim, head of GAO's homeland security division.
...
"They didn't say what was new and they didn't suggest any additional measures to be taken other than
please be a little bit more vigilant and please go about your shopping. I think that that really
attacks the credibility of the government warning system," {said Yim}.
http://edition.cnn.com/2004/US/07/13/terror.security.reut/index.html