One person has now been released from hospital after being stabbed at the Wireless music festival in east London.
Two people were attacked during the event this weekend.
More top news
Inspectors also found the electric meter had been bypassed to avoid paying for electricity.
Anthony Birdee from Deptford in south east London tied the English bull terrier, named Muller, to a post in his garden.
A report warned overcrowded streets could lead to a 'Hillsborough scale' tragedy.