Shoppers and commuters were seen running around Oxford Circus in panic and sought shelter in shops and offices after the tube station was evacuated.
They added: "Given the nature of the information received, the Met responded in line with our existing operation as if the incident was terrorism, including the deployment of armed officers".
People run down Oxford Street, London, Britain on November 24, 2017.
The Oxford Circus station is at the heart of London's shopping hub, Regent Street, and is only minutes away from Piccadilly Circus. The area is a crowded shopping district in the center of the city. Thousands of people ran in panic or took shelter in stores along busy Oxford Street. The force, which patrols the train and subway network, said it was investigating what had caused the initial report of shots inside the station.
The search went on for an hpur but the police could neither find a suspect nor evidences of firing.
British Transport Police tweeted just after 4:40 p.m. that officers were are on the scene.
The source of the panic remains unclear, but BBC News reporter Chi Chi Izundu claims that an "electrical fault" at the tube station may have been mistaken for the sound of a gunshot.
"I was next to the Tube station and everyone started screaming and shouting and then a flood of people came up the stairs", 37-year-old Greg Owen said.
Police have said that terror attacks are being planned with more intensity than ever before, and have a much better chance of succeeding than in the past.
"The store we were in was locked down, the manager wouldn't let us leave - they said there had been a shooting at the entrance of the Tube station", Woodward said.