More than 50,000 people are attending the annual St Patrick's Day Parade in London. Double Olympic gold medal winner, Kellie Harrington, and Irish Paralympic gold medal winning cyclist, Katie-George Dunlevy, are this year's grand marshals.

St Patrick's Day celebrations in central London are returning on Sunday. Organised by the mayor of London and the London Irish Centre, a parade featuring floats, marching bands, dance troupes and pageantry will travel from Hyde Park past Trafalgar Square and on to Whitehall.

In one of the most bizarre St Patrick's Day celebrations from around the world, the Chicago River is dyed green to mark the occasion. Each year the Chicago Plumbers Union dumps a concoction into the waterway from a series of plumping pipes and spout pumps.