Police have made "numerous arrests" for public disorder amid chaotic scenes after a concert headlined by acts including Stormzy and Liam Payne.
Officers attended several small-scale incidents after the KISS Haunted House Party at Wembley Arena.
A number of arrests were made for causing disorder, and order has now been restored to the area.
There were no reports of serious injuries, a Metropolitan Police spokeswoman said.
A spokeswoman for KISS Haunted House Party said "The safety of event-goers is of huge priority to us. We have cooperated fully with the venue and police to ensure a swift resolve to any issues."
Officers are on scene at #WembleyArea following significant disorder after the #KissHauntedHouse event.— Brent MPS | North West BCU (@MPSBrent) October 25, 2019
Numerous arrests have been made, officers are asking people to disperse immediately to the nearby #WembleyPark & #WembleyCentral Tube Stations.