Emergency staff attend to a person after an incident at Parsons Green underground station in London on Friday. Police have described Friday's attack on a London Underground train, which injured at least 22 people, as a terrorist incident. 
Police have described Friday's attack on a London Underground train, in which an "improvised explosive device" injured at least 22 people, as a terrorist incident.
This makes it the latest in a string of terror strikes on the country in recent years. Here is a recap of some of the others.
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