London police found no casualties Friday after investigating reports of shots fired at a busy subway station.
Police initially responded as if the incident were terror-related, but later said they "have not located any trace of any suspects, evidence of shots fired or casualties."
“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,” the police said in a statement.
Armed and unarmed officers are on scene and working along with colleagues from British Transport Police, which said a woman sustained a "minor injury" while leaving the area.
Videos posted on social media showed a rush of people leaving the area around the Oxford Circus tube station.
In a statement, the British Transport Police said officers were called to the station after reports of gunfire on a subway platform.
The area is a crowded shopping district in the center of the city. Social media reports said people were seen running from the area.
Passengers then "self-evacuated" onto the street, causing a "significant level of panic which resulted in numerous calls from members of the public reporting gunfire," the statement said.
It added that police are still investigating the incident.
British Transport Police posted CCTV images of two men on Twitter, saying they believed that an altercation had erupted between the two men at the Oxford Circus underground station and said they would like to speak to the men, “who they believe may have information about the incident and the circumstances around the incident.”
The capital’s transport operator, Transport for London, said the Oxford Circus and Bond Street stations, which were briefly shut because of the incident, had later reopened.
In Photos: London Subway Incident