French investigators have already heard from at least five complainants, the latest in October, sources close to the case told AFP. Some have hesitated to come forward because of trauma or fear.
French prosecutors are examining the Al Fayeds over allegations that their wealth and businesses were used to enable sexual abuse. Accounts given to investigators describe an organisation in which that empire was allegedly mobilised for predation, through a mechanism complainants say was carefully devised.
Complainants have told investigators of a system aimed at recruiting young women who hoped for a career at Harrods, or for work as assistants. They said the process included invasive gynaecological examinations and led to made-up jobs that put them at the disposal of the Al Fayed brothers.
The Ritz is one of the late tycoon's high-end ventures where victims have said they faced abuse. Investigators have treated it as one site among the properties now being searched.
The management of the Ritz told AFP it"does not tolerate any form of harassment, abuse or inappropriate behaviour". It said it was ready"to cooperate fully with the competent judicial authorities".
French and British investigators are now sharing information on the case. The prosecutor's office said UK authorities were present during the recent operations in France.