Commuters in London are paying the highest fares in the world. The warning from MPs in today's Evening Standard reveals major cities, including New York and Berlin have cheaper single fares than the Oyster Card.
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Hundreds of passengers were ordered to leave the terminal building and flights grounded after passengers suffered difficulties breathing.
Council leaders today called on the government to provide extra money to help resettle the youngsters in the capital.
An eyewitness said: "It was very unnerving. It was just after 12pm and there were suddenly police vans and cars everywhere."