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Forces from across the country have simulated a terror attack in Tyne and Wear to train officers.
Devices were hidden in a worksop, there were two car bombs and a suicide bomber on a Metro train.
Over 150 emergency officers worked around the clock, in 10-hour shifts, for 52 hours from Friday until Sunday to deal with the five scenarios.
There were 80 mock casualties, ranging from the walking wounded to fatalities.
The main focus of the exercise was to locate and rescue casualties who were trapped or buried in various locations.
Forces from across the country took part including Urban Search and Rescue teams from Tyne and Wear, West Yorkshire, Hereford and Worcester, Merseyside, Hampshire and Lincolnshire Fire and Rescue Services, together with the police, ambulance service and government agencies.
The exercise was organised and co-ordinated by Tyne and Wear Fire and Rescue Service and the Fire Service's National Resilience Assurance Team (NRAT).