The woman, who has been taken to hospital, fell at the store’s flagship branch in Oxford Street on Sunday afternoon. Police are said to be treating the incident as non-suspicious.
Customers have spoken of their shock at witnessing the woman’s fall. One 19-year-old shopper, who asked not to be named, told the Evening Standard: “We were on the ground floor as it happened, and she landed on the basement floor.
“There was a very loud bang and lots of screams. It was really awful – no one really knew what to do. It was very, very busy and there were a few kids. I witnessed a lot of people walking from the escalator where they saw the incident running outside crying and covering their eyes. Everyone was just in shock.
A police spokesman said officers were called to the store at 3.25pm. He said an ambulance and air ambulance also attended the scene and the woman was taken to hospital in a serious condition. Debenhams have not publicly commented on the incident.