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
A boy has died after he and his friends were attacked while cycling in north London.
Three police officers have been praised for their actions in helping a four-year-old boy who had become stuck on a roof in Newham.
A mother who lost precious photos of her dead infant son when her tablet was stolen is appealing for them to be returned.