Police and fire investigators are carrying out a joint investigation of the fire on Eastbourne pier.
Detective Inspector Mark O’Brien said, “The cause of the fire is currently unexplained and it may take some days for us to establish a fuller picture.
“In the meantime we are asking anyone who was on the pier at or just before the fire broke out, shortly after 3pm on Wednesday, to contact us if they have any video footage or stills photos they shot at that time.
“If you help please call us via 101 or email email@example.com quoting Operation Barsham. This could help us to put together the circumstances.”
The cordon on the road immediately outside the pier has been removed but the structure is unsafe and a cordon will remain around the base of the pier where debris has fallen on to the beach.
Emergency services thank the public for their co-operation in avoiding that area in particular.