There have been 209 arrests made so far today, 25 July aspart of the Metropolitan Police Service's major crackdown on thieves.
109 stolen mobile phone handsets have been recovered.
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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."