Two package bombs that originated in Yemen and were bound for Chicago were addressed to two historical figures known for persecuting Muslims, authorities said. Authorities believe the individuals behind the plot intended for the packages to explode before reaching Chicago. Meanwhile, the U.S. has boosted screening of cargo bound for the U.S., and President Barack Obama has spoken with Yemen's president about air cargo security and related issues. Officials have also expanded the definition of "high-risk cargo" to include more packages.

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