The aftermath of a March 2006 explosion of hazardous cargo on a container ship.

The aftermath of a March 2006 explosion of hazardous cargo on a container ship. The Congressional Research Service estimates that more than 100,000 marine shipments (54 million tons) of chemicals that could cause mass casualties passed through U.S. ports in 2003, the latest year for which data were available. Image courtesy of Royal Netherlands Navy.

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