European Central Bank President Mario Draghi said he "very much" welcomed the Eurozone finance minister's decision to reduce the Greek debt target.
Mr Draghi said following the meeting in Brussels that it would "certainly reduce the uncertainty and strengthen confidence in Europe and in Greece".
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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.