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.
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.
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".
'The operation is part of continuing and extensive inquiries by police and the security service into alleged international terrorism,' the Metropolitan Police said.