Details have been released of the victory parade through London to celebrate the achievements of British Olympians and Paralympians.
It will take place in two weeks' time - Monday, the 10th of September.
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The 34-year-old victim was left with a huge gash across her nose and face. Police need to find a man seen on CCTV.
The girl was travelling on a train from London Liverpool Street to Romford in Essex after going to see the poppies at the Tower Of London.
Wealthy businessman Ivan Massow wants to succeed Boris Johnson at City Hall in 2016.