By Kate Holton LONDON (Reuters) – Police arrested an 18-year-old man in the departure lounge of the port of Dover on Saturday in what they said was a “very significant” step in the hunt for whoever planted a bomb on a London commuter train that injured 30 people a day earlier. Prime Minister Theresa May put Britain on the highest security level of “critical” late on Friday, meaning another attack may be imminent, and deployed soldiers and armed police to strategic locations such as nuclear power plants. On Saturday morning officers in Dover, a ferry port on the southeast coast from which passenger ships sail to France, arrested a man and then partially evacuated the area, recovering a number of items, the police said without elaborating.
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