London (CNN) Authorities in London want to speak with two men about an incident at the Oxford Circus train station Friday, according to a news release from the British Transport Police.

Officials think there was an altercation on a platform at the underground station on Oxford Street, in the heart of the city's shopping district. They released images of the men from surveillance cameras.

The two men "may have information about the incident and the circumstances around (it)," the transport police said. They also appealed for witnesses to come forward about the incident, which caused a mass panic.

We are releasing CCTV images of two men we would like to speak with following the incident at Oxford Circus earlier today.



Anyone with information, big or small, should get in touch by texting us on 61016. https://t.co/h71UlCqxFa pic.twitter.com/mRd8k2YIMq — BTP (@BTP) November 24, 2017

Police had received multiple reports of shots fired at 4:38 p.m. on Oxford Street and at the station. They gave no details on what happened, but crowds were seen running down Oxford Street, a shopping strip usually busy with pedestrians and heavy traffic.

Armed police responded to the call and blocked off the area.

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