South Korean troops rehearse terror attack response
21 August 2012 Last updated at 13:10 BST
South Korean troops have been rehearsing a terror attack by staging an exercise in Seoul.
The drill was carried out in a busy underground station in the city to practice their response in the event of a bomb or chemical explosion.
General Lee Jae-hong, from the South Korean military, said that the purpose of the event was to improve their ability to cope with toxic gas threats.
Roopa Suchak reports.