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Article snippet: LONDON — The British police said on Saturday that they had arrested an 18-year-old man in connection with the terrorist explosion in a London subway station that injured at least 30 people and unleashed panic among fleeing passengers. The suspect was detained in the port area of Dover, in the southeastern county of Kent. The police said he would be transferred to a South London police station later. “We have made a significant arrest in our investigation this morning,” Deputy Assistant Commissioner Neil Basu, the top counterterrorism official at the Metropolitan Police in London, said in a statement. The suspect was not identified further. The Islamic State claimed responsibility for the blast on Friday in a statement that said “a detachment” of its militants had carried out the attack. Britain raised its terror threat level to “critical,” the highest level, after the explosion, meaning that another assault was “expected imminently.” Mr. Basu said on Saturday that the threat level would remain that way as the investigation continued. Ben Wallace, the security minister, told the BBC’s “Today” radio program that the homemade device used in the attack had contained triacetone triperoxide, or TATP, an explosive similar to the one used in the Manchester Arena bombing in May. The Metropolitan Police said a major hunt was still underway for any other suspects connected to the subway bombing. The police in Kent warned residents in a statement on Twitter to expect more of... Link to the full article to read more