Heavily armed police responded Friday to London’s Oxford Circus subway station in the heart of the British capital’s main shopping district after hundreds of people fled amid unfounded reports of shots fired.

“To date police have not located any trace of any suspects, evidence of shots fired or casualties,” the Metropolitan Police said in a statement.

Scotland Yard earlier said the incident was being treated as a potential “terror incident,” the Telegraph reported.

“Armed and unarmed officers are on scene and dealing along with colleagues from BTP,” Scotland Yard said, referring to the British Transport Police.

BTP said it had received “one report of a woman sustaining a minor injury when leaving Oxford Circus station. There are no other reported casualties.”

A Telegraph employee was shopping at John Lewis with her daughters when people stampeded for the doors and screamed because of the gunshot reports.

The three were ushered into the basement of a pharmacy around the corner from Oxford Street, along with many other shoppers.

“We were in the women’s section on the second floor when there was loads of screaming and a mass stampede,” she said. “People we are with said they had heard gunshots.”

BBC producer Ruaridh Arrow tweeted: “Police officers on the scene have told me this is not a mass casualty attack. No ambulances beyond the cordon. Sense the incident is drawing down.”

Lisa Markwell told LBC radio that she was traveling in a car when she saw a “mass” of people screaming and running.

“From the back entrance of Bond Street station, I saw a police car. Three armed police officers got out and ran towards Selfridges,” she said, according to the Telegraph. “It’s such a massive shopping day, there were lots of people around.”

Journalist Gavin Glicksman told the Sun that there was a heavy police presence in the area before the incident because of a performance at The Palladium nearby.

“There were lots of people sheltering inside shops on Carnaby Street and the nearby area,” he said. “From what I can tell now it seems to all be over.”