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Dramatic pictures show dozens of police cars, helicopters and ambulances rushing to the busy Underground station.

Transport for London said police were investigating "an incident".

Witnesses took to Twitter to tell people to avoid the area as armed officers swarmed the station.

(Image: TWITTER)

One wrote: "Just been evacuated out of Old Street station.

"Armed police came to the platform and told us all to leave immediately."

Several people later reported hearing a bang and the station was evacuated.

Initially, Transport for London said Metropolitan Police officers were investigating “an incident”.

But cops later confirmed that the scare was due to a man acting suspiciously on a train.

(Image: TWITTER)

A Met Police statement said: "Police were called to reports of a man believed to be acting suspiciously on an underground train.

"Several people subsequently reported hearing a bang. No firearm or any other object was seen.

"Officers, including firearms officers and the British Transport Police, attended the Old Street area and the station was temporarily evacuated.

"There were no reported injuries.

"At this stage nothing suspicious has been found and the incident has now been stood down.

"There have been no arrests and enquiries continue."

(Image: TWITTER /JON EVANS)

London has been in a heightened sense of panic after a string of security scares in recent months.

And Britain has been hit by a series of terror attacks on London Bridge, Westminster Bridge and the Manchester Arena this year.

Three terror attacks in the capital this year involved vehicles.

In response scientists are trying to create invisible barriers to prevent terrorists from carrying out van attacks.

Two Iraq war veterans have also revealed essential tips on how to stay alive if bystanders are caught up in a terror attack.