London police released these photos of two men in connection to the incident at the Oxford Circus subway station.
Police are looking into what led people to flee the station.
British police are responding to an "incident" at London's Oxford Circus station in the city's main shopping district, during rush hour on Friday.
The station is now closed, please avoid the area at this time.
"Officers believe an altercation erupted between two men on the platform".
Ch Supt Martin Fry said: "I would like to thank the public and the media for assisting us with this witness appeal".
Trains were not stopping at Oxford Circus station after the incident, but it has since reopened.
One patient was transferred to a major trauma centre for leg injuries, while eight people were taken to central London hospitals for minor injuries.
There was panic around Oxford Circus and in its underground station shortly after 4:30pm (1630 GMT), as police said they were responding "as if the incident is terrorist-related".
Faced with potential news of a gunman, and fearing the worst, police commanders dispatched large numbers of heavily-armed officers to the scene, in line with their terror attack protocols.
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King applauded the women for speaking out, and said she hoped their bravery would produce tangible policy change. King responded, "I think things are changing and that is a good thing". "We need to be such a place".
Armed police officers on Oxford Street after the incident.
Crowds ran from the scene, many rushing into already packed shops for safety, reflecting the nervousness in a country that has seen five terror attacks since March.
Shopper Ahlam Ibrahim told AFP she was pushed into a shop when people started shouting.
"Officers working with colleagues from British Transport Police carried out an urgent search of the area".
"I got up to the top by the ticket barriers and they were all open". I'm inside" before adding, "Really not sure what's happened!
"There were people running in all directions".
He said: "It is vital that we are not complacent - if in doubt it is always best to err on the side of caution and call the police on 999".
The police said they had found no evidence of previously reported gunshots, and that there were no casualties.
Anyone with any information can call BTP on 0800 40 50 40 or text 61016 citing reference 405 of 24/11.