Ben Sampayo said he was asleep in the Brighton hotel room where the footballers were with the 19-year-old.
Sussex Police are also investigating thefts during fires at a Brighton hotel, Brighton Museum and Art Gallery, and the city's Sealife Centre.
In October 1984, an IRA bomb exploded in the Conservative conference hotel in Brighton.
The prosecution alleges they humiliated a 19-year-old woman at the Jury's Inn Hotel in Brighton in July 2011, for sexual gratification.
BBC: Anton Rodgers, George Barker, Steve Cook and Lewis Dunk
The assault was alleged to have taken place in July 2011 while the woman slept in the Jury's Inn Hotel in Brighton.
The prosecution alleges they humiliated a sleeping woman aged 19 at the Jury's Inn Hotel in Brighton for sexual gratification in July 2011.
Countryside campaigners today accused Labour of "stifling" liberty and risking the creation of a society of "Stasi and thought police", after the party banned their press conference in the main hotel in Brighton.
There would be IRA outrages at the Harrods department store, in London's Hyde and Regent's Parks, in Enniskillen, Northern Ireland, and, in October 1984, at the Grand Hotel in Brighton, where Thatcher was herself the principal target.
The three Brighton and Hove Albion players and Mr Cook, who now plays for Bournemouth, are alleged to have sexually assaulted the woman while she was asleep at the Jury's Inn Hotel in Brighton in July 2011.
BBC: Woman 'too scared' to report sex assault charge players
Thatcher was the target of a hotel bombing in Brighton by the Irish Republican Army in 1984, and two of her close colleagues were killed in IRA attacks.
The first fire was at 14:00 BST on Sunday at The Royal Albion Hotel in Old Stein in Brighton.
Councillors had to choose between two proposals, but decided the arena would bring more people and more money to the city of Brighton and Hove than the rival bid for a luxury hotel and spa.
BBC: NEWS | UK | England | Southern Counties | Seafront plan for ice rinks approved
应用推荐