Scotland Yard said two passengers still remain trapped on the bus and two uniformed police officers who were travelling on the bus, are among the 30 injured.
London Ambulance Service say 6 people are seriously injured.
More top news
Transport officials meet with Google in a bid to bring driverless cars to the streets London
Twenty-one-year-old pair raise nearly £40,000 in the world's toughest row.
'Football sized' rubbish tip blight the lives of New Cross locals