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The Port of Miami was hit by its second terrorism scare in two days Monday when a package that was to be loaded onto a cruise ship tested positive for plastic explosives. Authorities later determined it was harmless.

The package was initially tested six times, and each time it came back positive for the military-grade explosive known as C4, the Coast Guard said.

The package was then destroyed, and a Miami-Dade County police bomb squad determined it contained sprinkler parts, said Zach Mann, a spokesman for U.S. Customs and Border Protection in Miami.