There have been "numerous" arrests following mass disorder at the KISS Haunted House Party at Wembley Arena.
Stormzy and Liam Payne were on the line-up at the gig in north London.
Police ordered revellers to leave the area immediately via two Tube stations.
It's understood a nearby McDonald's had to shut because of the disorder, according to reports.
The Met Police tweeted: "Officers are on scene at Wembley Area following significant disorder after the Kiss Haunted House event.
"Numerous arrests have been made, officers are asking people to disperse immediately to the nearby Wembley Park & Wembley Central Tube Stations."
Stormzy, Sean Paul, Young T & Bugsey, Anne-Marie, Liam Payne, Jax Jones, Aitch, and Majestic were all confirmed to perform at the gig.
Organisers promised this year's event – the sixth they have organised
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