There is no evidence of shots being fired or any casualties on London's busiest shopping street, police said, after responding to reports of gunfire.

There was a "significant level of panic" on Oxford Street and at Oxford Circus Tube station as witnesses said they heard shots.

But after armed police responded to the area which was packed with Black Friday shoppers and rush-hour commuters, they announced nothing had been found and the Tube station has re-opened. One woman suffered minor injuries in the crush as the station was evacuated.

READ MORE: Gunshots reported on packed Oxford Street as Black Friday shoppers told to hide

In a statement British Transport Police said: "At 4.37pm this afternoon, officers were called to Oxford Circus station following reports of gunfire on the westbound Central Line platform.

The Herald:

"Passengers at the station then self-evacuated the station onto Oxford Circus and Regent Street area of London.

"This caused a significant level of panic which resulted in numerous calls from members of the public reporting gunfire.

"Officers responded in line with our procedures of a terrorist incident; this included armed officers from British Transport Police and the Metropolitan Police. A full and methodical search of the station and Oxford Street was conducted by officers.

READ MORE: Gunshots reported on packed Oxford Street as Black Friday shoppers told to hide

"At this stage, we are examining the circumstances of the incident which resulted in the station being evacuated.

"During the station evacuation, one woman is believed to have sustained a minor injury."

Paramedics treated a number of people who suffered injuries leaving the incident at Oxford Circus tube station, discharging seven patients at the scene and taking nine to hospital, London Ambulance Service said.