Images on social media show fire crews were in attendance. Writing on Twitter, Julia Chandler said in response to the evacuation: “Train I’m riding on is not stopping there.”
Ms Chandler later added: “Saw two firemen on platform nine not looking particularly worried.”
The British Transport Police told Express.co.uk the alarm was sounded after a person became stuck in a lift.
A spokesperson said: “This was due to a fire alarm being activated. No fire, someone was stuck in a lift and raised the alarm. Reopened at 2.20pm.”
Shortly after the evacuation, rail firm Greater Anglia said in a post: “Due to the fire alarm sounding at a station at #Stratford:
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A spokesperson for London Fire Brigade confirmed there is not a fire at the station.
They said a “fire alarm has gone off” and crews have been deployed to investigate.
A Network Rail spokesperson also confirmed a fire alarm had been sounded.
They added that the station reopened around 2.30pm.