It's not unprecedented, and there's no current threat to water supplies, but officials are prepared to start building an underwater barrier to block the denser saltwater from moving further upstream, Corps spokesman Ricky Boyett said Friday.

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Hollande and his party consider this a stumbling block but not a barrier to raising taxes.

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The Egyptian government has also ordered an underground barrier to be built along the border with Gaza, to block the tunnels.

ECONOMIST: The Gaza Strip