What were 700 teddy bears doing on London's St Paul's Cathedral steps this morning?

As part of a campaign to highlight the plight of children fleeing the conflict in South Sudan, international children's charity World Vision UK launched its #BearsOnStairs campaign earlier in July. The campaign culminated with an installation on the steps of London's St Paul's Cathedral on July 27, where 700 teddy bears were placed to represent the number of fleeing South Sudanese children who arrive in Uganda each week.