The workers were constructing a mining operation underground when they were hit by a high-pressure release of grout, said Bronson Mack of the Southern Nevada Water Authority, a cooperative public agency formed in 1991 to manage the water resources in a region that includes Las Vegas.

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Though some agencies like the U.S. Coast Guard and the Federal Emergency Management Agency have been cooperative, other agencies -- like the Department of Justice, Department of Homeland Security and the Department of Health and Human Services -- have ignored the committee's requests or produced substantially less than was requested, the senator said.

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"The pharmacy staff and management have been cooperative, " the state health agency said.

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Steve Sinkevich, a senior biologist with the U.S. Fish and Wildlife Service who monitors the nests at Breezy Point, said the agency, the parks service and the cooperative collaborate to protect the birds with the least amount of recreational interference.

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The Cassini-Huygens mission is a cooperative project between Nasa, Esa and the Italian Space Agency (Asi).

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