"It is a fluid situation, it is ongoing, " Cameron told the Reuters news agency.
And that is why there is new information based on a very fluid situation.
In a fluid situation like Iraq, there are 10 things happening every day.
Unfortunately, no primer can tell Sir Menzies what he should do in what is likely to be a fluid situation.
This is obviously still a very, very fluid and dangerous situation in Libya, and a very fluid situation in the region.
And this is a very dynamic, fluid situation in all these countries.
It is obviously a very fluid situation and everybody is searching for the most -- the best information available in a crisis situation.
How does he explain welcoming those leaders here at the White House at the same time when there is a fluid situation in the Middle East?
Police have said they are going door-to-door in Watertown due to what they describe as a "fluid situation", warning residents not to open their doors to anyone other than a clearly identified police officer.
What I think it says is, there's a very fluid situation and of course, if I may say, polls are all very well, but these polls don't actually address the real electorate, which is in the House of Commons.
Right now what you have is a very fluid and dynamic situation.
"This remains a fluid and evolving situation and many details remain unclear, " British Foreign Secretary William Hague said in a statement from Australia.
Obviously we are watching and monitoring very closely a very fluid and dynamic situation, so I will do my best to answer some of your immediate questions.
Steel said this issue is something that must be watched day to day, as the situation is fluid.
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The situation remains fluid, but we are monitoring this closely.
Mrs Clinton said Algerian Prime Minister Abdelmalek Sellal had told her on Friday that the "operation was still ongoing, that the situation remained fluid, that the hostages remain in danger in a number of instances".
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"The situation remains fluid, and it remains too early to establish the cause and motivation, " the FBI's Boston Division said in a statement asking people to call in with any information, images or details related to the explosions.
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The situation is still fluid as Greek citizens are very unhappy about the austerity issue.
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The situation is so fluid I wouldn't even rule out the possibility of Eriksson leaving out either Gerrard or Lampard at some point down the line.
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"The national situation is definitely fluid, " said Tom Robbins, Missouri's director of adult education and high school equivalency, noting that other states plan to use the GED for now and bid later.
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