London has been placed seventh in a global league table of the cities most attractive to young people.
The capital scored highly for diversity, digital access and financial access - but was pushed down the rankings because of high youth unemployment.
Toronto came out on top, followed by Berlin and New York City.
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Pictures of today's events unfolding following a major security incident at the Houses of Parliament.
At least two people have died after a knifeman brought terror to the heart of Westminster.
The Cobra committee brings together government ministers with senior officials of the emergency services and security agencies.