Police investigating after a woman was raped in broad daylight say that a drone could provide vital evidence.
The victim, aged in her twenties, was walking along a path through woodland at Amberswood Nature Reserve, near Hindley in Wigan, on Sunday 18 February.
Two men began to follow her. Police said as she turned a corner, two other men were stood in front of her. She was then raped.
Police have said a member of the public was flying a drone in the area at the time, and may have inadvertently captured footage or images.
They have now appealed for the pilot to come forward.
Detectives also want to trace and speak with a number of potentially key witnesses - a person wearing a white coloured coat who was in the area at the time and two people who were walking a dog.
The woman is being supported by specially trained officers. Police say they have laid on additional patrols in the area.