Police were called to a £1 million property in north London to break up a party after 600 people turned up. According to the Evening Standard, the event was advertised on Facebook by a friend of 17-year-old Christopher Seale. He didn't realise the information could be seen by anyone.
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The impact of the 4mph crash pushed the buffers back by over a metre.
The 18-month-old puppy lives with owners Chris & Gillian French and their 10-year-old daughter Mia at the Mitre pub in Richmond-upon-Thames.
Detectives are hunting two suspects after the 23-year-old victim was left with a broken rib and a deep cut to his lung.