Authorities in the US territory of Guam have turned away a ship after thousands of spiders overflowed from its cargo. The Guam Department of Agriculture said hundreds of large spiders and thousands of smaller ones were seen when stevedores began offloading insulation and beams for housing units from the ship, the M.V. Altavia. The cargo was returned to the ship, and the Agriculture Department Friday ordered that the ship not be allowed to dock. It was last ported in South Korea. “When you get this many from this many various sizes, it's definitely an infestation,” said Department of Agriculture Director Joseph Torres. Agriculture officials said they didn't know what type of spiders were on the ship. But they said it's a type that is not normally found on Guam and there was concern the spiders could damage the island's environment. The ship was carrying housing units and accessories that were to be used at a work force village expected to house up to 18,000 temporary workers.