Two men were stabbed and another slashed during We Are FSTVL in Dagenham this weekend.
At 6.43pm on Saturday (September 11), officers on duty at Central Park - where the dance music festival was taking place - were alerted that three men had been assaulted.
Two men, aged 24 and 18, had been stabbed and were taken to hospital by the London Ambulance Service.
Their injuries have been assessed as non-life changing and non-life threatening.
The third man, also aged 24, had been slashed on the arm.
He was provided with first aid at the scene and did not require hospital treatment.
A Met spokesperson said: “At this early stage there have been no arrests but an investigation is underway to establish what took place and to identify those involved.
“The park was busy at the time of the incident and it is likely that a number of people saw what happened.”
Anyone with information is urged to call 101, giving the reference 2606/11SEP.
Information can also be provided anonymously to Crimestoppers by calling 0800 555 111.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here