911 was released as a free download from gorillaz.com in December of 2001. The track is a collaboration between Gorillaz, D12 and ex-Specials main man Terry Hall. 911 was recorded in the aftermath of the September 11th tragedy. Detroit rap group D12 were scheduled to fly home to America from London, but were however trapped in England, and during that time went into the studio with Gorillaz to record this track. Specials legend Terry Hall also provides backing vocals. The track was available to download with full cover art so that fans could burn and package their own CDs of the track at no cost. A streaming video using Flash technology was also released.