As the July 4 holiday approaches, Bush Administration officials are bombarding the nation's police, fire, emergency and corporate-security offices with another round of terrorism warnings. Although there are no plans to raise the threat level from yellow to orange, a senior Justice Department official says, "there's very serious intelligence that's corroborated, that's multiple sourced, that indicates that al-Qaeda is intent on hitting us and hitting us hard this year." The official concedes, however, that "we don't have specific information." Along with this now familiar general warning, the FBI has introduced the specter of a new terrorism threat: booby-trapped beer coolers....