A toxicologist from Leeds University has played down claims from Labour's shadow environment secretary Mary Creagh that the drug phenylbutazone causes cancer in humans.
Professor Alistair Hay said there is "no convincing evidence of carcinogenicity".
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Rescuers only managed to save 15 of the short-finned pilot whales that were beached on Hamelin Bay.
Four men who violently broke into a home and threatened the family inside are being hunted by police.
According to media, the incident in southern France took place after a police officer was shot and wounded.