Late on Wednesday, the office of the UK's prime minister said David Cameron had agreed in a telephone call with Mr Obama that the use or threat of chemical weapons was "completely unacceptable and would force them to revisit their approach so far".

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The main treatment is injections of a chemical to cut levels of testosterone - the driving force of many prostate cancers - but it causes side effects.

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Instead, he started his own company and spent the next few years buying and selling a weed killer from Helena Chemical, competing with Helena's own sales force for meager margins.

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While slightly smaller forces were capable of prevailing without a significant increase in risk in the base case of the analysis, a larger force was judged necessary to conduct these operations with acceptable risk when either enemy chemical weapons were used or shorter warning times were played.

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He and Berrard are buying up businesses in the industrial cleaning, waste and chemical sectors, aiming to expand the combined Swisher Hygiene entity into a nationwide force, all with the same red-and-white logo.

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The United States has deployed a few hundred troops to Jordan, just south of Syria, with the purpose of aiding refugee care and, according to a Los Angeles Times report, as "the vanguard of a potential military force of 20, 000 or more" in case the United States decides to move to secure Syria's chemical weapons.

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