Festival-goers have been told to leave amid a "serious incident".
Emergency services have flocked to the Big Church Festival, which is being held on the Wiston Estate near Steyning, after reports of a sign having fallen and injured multiple people.
A spokesperson for South East Coast Ambulance Service (Secamb) confirmed at least six people have been injured.
It said: “Ambulance crews, critical care paramedics and specialist response teams are currently on scene with six patients confirmed so far.
“We have no further information to share at this time but will provide updates as soon as possible.”
Sussex Police said it was called to the scene just after 3.30pm and are assisting other emergency services.
In a post shared on social media, it said: "Emergency services are currently responding to an incident at an event near Steyning.
"It follows reports of a sign having fallen and injured a number of people at the site in Washington Road.
"Police were called at around 3.38pm and remain at the scene, assisting other emergency services, at this time.
"As a result, there is likely to be some traffic disruption in the local area, and we would urge the public to seek alternative routes if possible.
"We have no further information at this time, but will provide any updates as soon as we are in a position to do so."
Attendees received an email from festival organisers stating an immediate show stop due to a "serious incident on site".
The email asked visitors not to attempt to access any stages or content areas.
Big Church Festival have since shared a statement on social media.
It said: “We are very sorry to inform you that today’s show has been cancelled due to a serious incident.
“All day visitors must leave the site now. If you are camping with us, please return to your campsite and await further updates.
“Campers may leave the site if they wish to do so.
“Thank you for your patience and understanding. We will share further updates as soon as we can.”
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