Deaf and blind people may be at higher risk of developing dementia, England's Chief Medical Officer has warned.
Dame Sally Davies said although the data was not conclusive, investigating a possible link between sight or hearing impairment and diseases such as Alzheimer's could aid doctors' understanding of dementia.
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Prime Minister Theresa May announced the decision from Downing Street.
A man, apparently armed with a small axe and a large stick, was detained close to the event and police cleared the area as a precaution.
A remarkably mild night