Stephen Lawrence's family are expected to meet Home Secretary Theresa May today to ask for a new public inquiry.
It follows claims claims that police secretly tried to undermine the family of the murdered teenager.
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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."