Cargo planes sit on the tarmac of Dubai airport Saturday, the day after a parcel bomb was intercepted in Dubai on a cargo plane originating from Yemen. Karim Sahib/AFP/Getty Images hide caption

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Security is in evidence at Duesseldorf International Airport in Germany on Saturday. Authorities on three continents thwarted multiple terrorist attacks aimed at the United States from Yemen, seizing two explosive packages addressed to Chicago-area synagogues and packed aboard cargo jets. The plot triggered worldwide fears that al-Qaida was launching a major new terror campaign. Frank Augstein/AP hide caption

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Law enforcement agents arrive at a United Parcel Service staging area at Newark Liberty International Airport, where a cargo plane was searched and a suspicious package removed Friday. Joe Epstein/FR170243 AP hide caption

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