In pictures: London terror test

1 of 9 London Mayor Ken Livingstone said the purpose of the exercise was to test out new equipment

2 of 9 Bank underground station was the focus of the emergency response to "a gas attack"

3 of 9 More than 350,000 people work in the area where the exercise took place

4 of 9 "Victims" went through a rigorous decontamination process

5 of 9 It was the first large-scale exercise since the September 11 attacks

6 of 9 Medical personnel were dressed in thick green rubber suits

7 of 9 Hundreds of police and other emergency services personnel took part

8 of 9 Casualties (dressed in orange) were taken to University College Hospital

9 of 9 Police cadets played the role of casualties