Italian broadcaster RAI has shown footage purporting to show the rescue operation underway off the coast of Sicily.
What appears to be the hull of a boat is visible under the green and red vessel.
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Through the day, most of the cloud should break up to leave fine conditions for many with spells of sunshine.
The Eiffel Tower in Paris was plunged into darkness, with the Burj Khalifa in Dubia emblazoned with the Union Jack.
The major party leaders' campaigns for the General Election will remain suspended on Wednesday following the Manchester terror attack.