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                                              Officials in 
                                              London and Washington said the 
                                              alleged plotters, many believed to 
                                              be British-born, had their sights 
                                              on United, American, and 
                                              Continental flights. Simultaneous 
                                              explosions were to have been 
                                              caused by chemicals in carry-on 
                                              luggage. Officials monitored the 
                                              plot for months before deciding 
                                              they had to move.  Experts say that 
                                              the foiled attack suggests Al 
                                              Qaeda involvement. Aviation is 
                                              still a favored target for Al 
                                              Qaeda acolytes bent on taking 
                                              terrorism to new heights. "The best way to 
                                              top the 9/11 event is to do it 
                                              with civilian aircraft with a lot 
                                              of people on board," says Rolf 
                                              Tophoven, a German terrorism 
                                              expert. "This will create huge 
                                              damage on all kinds of economic 
                                              and commercial levels." Bruce Hoffman, an 
                                              expert on terrorism at the RAND 
                                              Corp. in Washington, notes that 
                                              it's typical of Al Qaeda to go 
                                              back to targets and improve their 
                                              techniques on past attacks. The 
                                              successful attack on the USS Cole 
                                              in 2000 followed a failed bid to 
                                              sink the USS Sullivan in 1999. The 
                                              9/11 attack came eight years after 
                                              the limited attack on the World 
                                              Trade Center in 1993. This latest 
                                              effort, he adds, is a carbon copy 
                                              of the failed 1995 "Bojinka" plot 
                                              by Ramzi Ahmed Yousef, convicted 
                                              of being the mastermind of the 
                                              1993 World Trade Center attack, to 
                                              blow up 11 American airliners over 
                                              the Pacific, using plastic 
                                              explosives. Britain raised its 
                                              terror alert levels to the highest 
                                              notch, while the US put a red 
                                              alert - the first time that level 
                                              was invoked - on flights from 
                                              Britain. All other US flights were 
                                              one step below, at "orange." US Homeland 
                                              Security Secretary Michael 
                                              Chertoff and Peter Clarke, deputy 
                                              assistnant commissioner for 
                                              Scotland Yard, said the plot was 
                                              international in scope and 
                                              involved many people. President Bush, in 
                                              Wisconsin, said that the US was 
                                              safer than it was before 9/11. 
                                              "We've taken a lot of measures to 
                                              protect the American people but 
                                              obviously we're not completely 
                                              safe," he said. But, he added, "It 
                                              is a mistake to believe there is 
                                              no threat to the United States of 
                                              America." Officials would 
                                              not say exactly how many aircraft 
                                              were targeted, nor when precisely 
                                              they thought the plotters would 
                                              strike. French officials said 
                                              Thursday that the plotters were 
                                              probably of Pakistani origin. 
                                              British officials refused comment. The number of 
                                              suspects involved points to a far 
                                              bigger operation than the 
                                              post-9/11 terror attacks in 
                                              London; Madrid; Bali; and 
                                              Casablanca, Morocco. Paul 
                                              Wilkinson, a security expert and 
                                              author of "Terrorism Versus 
                                              Democracy," says: "It's the scale 
                                              of conspiracy that is so worrying 
                                              because it's much larger than most 
                                              things we've seen since 9/11." Yet attacking 
                                              aviation targets has proved harder 
                                              since 9/11 because of heightened 
                                              security. To subvert that 
                                              vigilance, the plotters arrested 
                                              Thursday were allegedly planning 
                                              to smuggle aboard different liquid 
                                              chemicals that may appear 
                                              innocuous but could be explosive 
                                              if mixed. As a result, 
                                              passengers with babies Thursday 
                                              were ordered to take a swig of 
                                              their baby formula in front of 
                                              security guards to demonstrate its 
                                              integrity. Personal documents, 
                                              medication, and all other hand 
                                              luggage was banned from flights 
                                              out of Britain. The unravelling of 
                                              the plot marks another apparent 
                                              success for British 
                                              counterterrorism, which already 
                                              claims to have foiled a dozen or 
                                              so attacks since 9/11, four in the 
                                              past year. While some of these 
                                              have produced no convictions and 
                                              inconclusive evidence, security 
                                              expert Bob Ayers says this one 
                                              should be taken seriously. "You don't take a 
                                              decision to shut down all flights 
                                              to America lightly," says Mr. 
                                              Ayers, an expert with the Chatham 
                                              House think tank. "It would 
                                              suggest they have substantial 
                                              evidence." He adds that 
                                              British intelligence must have 
                                              somehow infiltrated the plotters - 
                                              a major success for organizations 
                                              that are scrambling to get up to 
                                              speed with the new terror threat 
                                              from radical, disenchanted 
                                              segments of the Muslim community. 
                                              "There could be more than one cell 
                                              involved here, but this means [the 
                                              intelligence services] have 
                                              penetrated more than one group or 
                                              the supporting infrastructure." Security officials 
                                              had a delicate task knowing when 
                                              to move, said Home Secretary John 
                                              Reid said. "Move too early, you 
                                              may not know the full scope of who 
                                              is involved and you may provoke 
                                              those you don't know into taking 
                                              the action you don't want. If you 
                                              don't move, you run the risk of 
                                              terrible consequences." But while the 
                                              "underresourced and 
                                              underappreciated" security 
                                              services have done commendable 
                                              work, says M.J. Gohel, a terrorism 
                                              analyst at London's Asia Pacific 
                                              Foundation, they've had less 
                                              success finding out who is 
                                              providing "homegrown" terrorists 
                                              with direction. British officials 
                                              regularly warn the public of the 
                                              threat. Wednesday, Mr. Reid said 
                                              that the country faced its most 
                                              sustained period of threat since 
                                              World War II. Britain is a 
                                              particular target because of its 
                                              backing for US foreign policy in 
                                              the Middle East. RAND's Hoffman 
                                              also notes that the fifth 
                                              anniversary of 9/11 is looming. 
                                              Despite comments that Al Qaeda may 
                                              be in retreat, he says, "nothing 
                                              is further from the truth. At 
                                              least in Europe, Al Qaeda has put 
                                              down an organizational structure 
                                              to sustain these attacks." • 
                                              Correspondents Christa Case and 
                                              Faye Bowers contributed to this 
                                              report.  |