Police in Bilbao have made a special trip to Wembley to meet their British counterparts and see how they secure the perimeter at the national stadium.
The incident involved a serious assault on a reveller at the Notting Hill Carnival, raising concerns about security and potential licence revocation for Volcano Sound System.
Washington is currently a city marked by heightened security measures, including concrete barriers and steel fencing, in the wake of intense political tensions and threats.