The US Attorney General Eric Holder has said that authorities negotiated with BP to resolve the civil claims it is facing but was unable to reach a "satisfactory" number.
He added that is was possible that the US and the oil giant could still resolve the claims out of court, but that officials are preparing for trial.
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The Epilepsy Society say women on the drug should get face-to-face annual reviews to avoid "heartbreaking" cases of avoidable disability.
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