Rescuers have been forced to abandon their search for victims of yesterday's boat accident on the Italian island of Lampedusa.
Strong winds and high waves means conditions are too dangerous for divers to enter the sea.
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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.