The President of the United States landed at RAF Fairford in Gloucestershire tonight (3 September).
He arrived on Air Force One just before 7 pm - before travelling on to the NATO summit which starts tomorrow in Newport.
Hundreds of people gathered at the air base to see his arrival:
President Obama's arrival, with the NATO summit is one of the biggest policing operations ever in the UK - 9,500 officers have been drafted in from 43 different forces.
Many are based at a temporary headquarters in Thornbury.
Robert Murphy reports on the police operation.