British police have made an apparent breakthrough in subway bombing, but the country remains on a "critical" alert, meaning that another attack is judged imminent.
Police arrested an 18-year-old man in the port of Dover the main ferry link to France and then launched a massive armed search in the southwestern London suburb of Sunbury.
The man is being held under the Terrorism Act and has been brought to London for questioning. His identity is a closely guarded secret and police have implored the press not to speculate while the inquiry unfolds.
When would Britain take action to combat the young terrorists running around?