Ceremony honouring Martin Luther King's 50th anniversary

Event in Trafalgar Square to honour Martin Luther King Credit: PA

A ceremony will take place in Trafalgar Square later today to mark 50 years since Martin Luther King Junior delivered his I Have A Dream speech.

50 to 70 young people will ring bells at 3pm to mark the moment the civil rights leader concluded his historic address in Washington in 1963.

The Let Freedom Ring event will be broadcast live from the YouTube studios in London via a Google+ Hangout On Air, following a panel discussion exploring the historical significance of the speech's message to young British people in the 21st century.