Flags are flying at half mast in Italy as the country marks a day of mourning following the death of more than 100 migrants who drowned at sea.
More than 300 people are believed to have died in one of the worst tragedies in Europe's decades-long migrant crisis.
Italian senators have held a minute of silence to honour the hundreds of victims of the boat accident on Friday morning.
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Here are the key moments that will take place on the day Article 50 is triggered and the UK begins the formal process of leaving the EU.