Officers from the Metropolitan Police Counter Terrorism Command arrested the teenager on allegations of preparation of terrorism under Section 5 of the Terrorism Act 2006, the Met police said.
After the operator crashed the remote-controlled aircraft into a jail wall.
A Bangladeshi family of 12 from England, who went missing on the way back from a holiday in Dhaka, have confirmed in a statement issued by terrorists that they are in the "Islamic State".
Johnson, 58, had been under investigation by a parliamentary inquiry looking into whether he misled the House of Commons about lockdown-breaking parties in Downing Street during the COVID-19 pandemic.
'The operation is part of continuing and extensive inquiries by police and the security service into alleged international terrorism,' the Metropolitan Police said.