The owner of the Drunken Ship pub in Rome, Marco Manzi, said there were around 30 Tottenham fans drinking quietly when a group of young men burst in throwing stones, waving clubs and metal rods. Manzi said the fight lasted around 20 minutes.
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Mr Kim has made two recent visits to China.
The study looked at the development of 422 children over the course of eight years.
The president said they will come into force if China refuses to change its practices.