Paolo Gabriele's lawyer has said the sentence is, "a just one," and that Gabriele is, "serene," about his sentence and supported by his family is, "ready to accept any consequences."
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The country's counter-terrorism forces have regained control of the facility.
The commissioner of the Metropolitan Police has said he cannot promise the public an attack will not take place.
The showers are likely to be particularly heavy across northern parts of the country.