His home in Broxbourne, Hertfordshire, was raided on Monday night by police carrying out an arrest warrant in connection with the attack, where they allegedly found a cache of firearms, cannabis plants and cultivation equipment.
Two clubbers, aged 24 and 29, were seriously hurt in the attack and have been moved to a specialist burns hospital in Essex, the Metropolitan Police said.
Detective inspector Lee McCullough said: ‘We now have 20 people suffering from the effects of an acidic substance being sprayed in a confined space in a busy nightclub.
‘All have burn related injuries. The noxious substance used has not yet been confirmed but samples retrieved from the scene have been sent for analysis.
‘If you were there and saw anyone involved inside or leaving the nightclub, please get in touch.’
A spokeswoman for her said:
‘Ferne is aware that the police wish to speak to Arthur Collins and the nature of the accusations against him. Obviously these are highly shocking and Ferne has co-operated with the police in their inquiries.