"The woman, from north London, was arrested at 21:02hrs on suspicion of preparation of acts of terrorism… The arrest is Syria-related," the Metropolitan Police said in a statement.
The 21-year-old was detained after flying in from Istanbul, police said. Two properties in north London were also searched in connection with her arrest.
The United Kingdom remains on a "severe" threat level for international terrorism, meaning an attack is highly likely. It has seen a series of knife and bomb attacks in the past months, inspired by an Islamist group operating in Syria.
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