Police rushed to London's Oxford Circus on Friday, sparking fears of a terror attack, but they have now stood down after finding no evidence to support reports of shots fired, the Metropolitan Police said.
Police said that at this stage there are not any casualties.
British Transport Police say officers were called to Oxford Circus Tube station following reports of gun fire on the westbound Central Line platform.
Armed police have arrived on the scene to handle the situation after a gunman was reported to be firing shots.
"The station is now closed, please avoid the area at this time", BTP said on Twitter.
Oxford Circus tube station was evacuated following a "customers incident".
"Officers working with colleagues from British Transport Police carried out an urgent search of the area".
Image Dr Glenn Wilson told Sky News the Oxford Street scare was created by a perfect storm
"Police have responded as if the incident is terrorist related".
Sky News reported Bond Street and Oxford Circus tube stations were close but have since been reopened.
"Our response on #OxfordStreet has now been stood down".
The reports sparked panic in the area around one of London's busiest subway stations. "If you sought shelter in a building please now leave", the Met Police said in a statement. "No casualties, evidence of any shots fired or any suspects were located by police".
"They were crying, they were screaming, they were dropping their shopping bags".
Oxford Circus station is closed.