Without a tip from Saudi Arabia, two packages that originated in Yemen and contained explosives would not have been detected, authorities say. The plot, which prompted the U.S. to heighten security after it was foiled late last week, highlights the gaps in air cargo security, experts say. Meanwhile, investigators believe an al-Qaida affiliate in Yemen is behind the plot. Some authorities believe packages were meant to detonate in midair and note that if the plot had been successful, it would have amounted to a rare attack on the air cargo system.

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