On Sunday, June 10, a Finnish national, 29, was stopped by the London police at Heathrow Airport while attempting to board a connecting flight. He was arrested on suspicion of preparation of terrorist acts for the following day.
He was placed under custody at a south London police station and further detention was obtained on Tuesday, June 12.
On Friday, June 15, he was released with no further action.
According to the Finnish newspapers, this was the third time a Finnish national was detained in the UK on a terrorism charge during the last two years.
One of the detainees was later convicted, while another got no terrorism-related conviction, but was imprisoned on another charge.
Source: The Metropolitan Police Service