By Joe Mellor, Deputy Editor
Around 800 volunteers were involved in a mock terror attack at the Trafford Centre, Manchester the second biggest shopping mall in Britain.
The clip is terrifying but thankfully bit real, but it shows how seriously security forces are taking the chance that a similar attack might happen for real.
The exercise took place at midnight and went onto the small hours of today. The stunt began with a suicide bomber detonating a device and killing and seriously injuring the innocent “shoppers.”
Armed officers from Greater Manchester Police, Merseyside Police, the North West Counter Terrorism and reportedly the SAS responded.
Watch the video here