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Armed officers arrested the 18-year-old in the north of the capital last night.

Scotland Yard said he was detained “in the street” by the Metropolitan Police's Counter Terrorism Command and taken into custody.

A Met Police spokesman said: "Officers from the Metropolitan Police Counter Terrorism Command arrested an 18-year-old man at around 12.10am on Friday, May 18 on suspicion of preparation of terrorist acts, contrary to Section 5 of the Terrorism Act 2006.

"The arrest took place in the street in the north London area and was carried out with the assistance of armed officers.