A glider pilot is currently stuck 30ft up a tree after crashing their craft into a tree on Chanctonbury Ring, a fire service spokesman confirmed.
A West Sussex Fire and Rescue spokesman said they were called to the landmark at 1.10pm following the accident.
They sent two fire engines, two land rovers, two technical rescue units and other officers to the scene.
The glider pilot is not injured, they said, but as they were stuck 30ft from the ground, it would be a 'difficult extraction'.
At the moment, firefighters are currently assessing their options, the fire service spokesman said. One option is for the technical rescue team, who are trained in line rescue, to scale the tree and rescue the casualty in that way.
The coastguard helicopter is also at the scene.
The pilot has now been saved; click here to see pictures of the rescue operation.