A man in his 60s has been interviewed under caution by detectives investigating abuse by former Harrods boss Mohamed Al Fayed.
The Metropolitan Police said the man was being questioned on suspicion of aiding and abetting rape and human trafficking.
The interview follows that of three women, aged in their 40s, 50s, and 60s, who were quizzed by detectives between 25 February and 5 March, also on suspicion of aiding and abetting rape and sexual assault, assisting the commission of sexual offences and human trafficking for sexual exploitation.
Police said no arrests have been made and the investigation is ongoing.
Al Fayed died in 2023 aged 94.
More than 150 victims have come forward to the police and reported allegations of sexual assault, rape, sexual exploitation and human trafficking to the police.
The Met previously said it was investigating individuals surrounding the businessman who could have enabled him to carry out more than 400 sexual misconduct crimes, which are claimed to have spanned decades between 1977 and 2014.
Earlier this month, the force said that officers had taken detailed accounts from victims and witnesses to build a comprehensive picture of the alleged offending over the past 18 months, allowing them to include allegations of human trafficking to the investigation.
Before any suspect was interviewed under caution, lawyers representing Al Fayed’s alleged victims urged police to treat the scandal as “trafficking allegations”.
Metropolitan Police commander Angela Craggs said that the update marked an important step in the “complex and far reaching investigation.”
“Victims remain at the centre of this investigation,” she said. “Today’s update marks an important step in a complex and far reaching investigation.
“While Al Fayed is no longer alive to face prosecution, we have always been determined to bring anyone who is suspected to have played a part in his offending to justice.
“We encourage anyone with information, whether you were directly affected by Mohamed Al Fayed actions or have concerns about others who may have been involved or committed offences, to contact us.”
Police pointed to the Crimestoppers hotline to share information anonymously via 0800 555 111 or through their online form.
“We will share further updates when we are able to do so and only when this will not risk jeopardising criminal or other proceedings.”
