A busy central London Tube station was evacuated after a fire alert.
Alarms sounded at Holborn station shortly after 2.30pm on Tuesday and crowds of people were led outside.
Tube services on the Central line were not stopping at the station while officials dealt with the incident.
London Fire Brigade said one fire crew was sent to the station to investigate.
A spokesman said firefighters were investigating why the alarm sounded and that there was no indication that there was a fire.
On social media, witnesses described how passengers were rushed off the platforms and told to leave the station.
George Maier tweeted a video with the caption: "Emergency evacuation at Holborn station."
Roisin O'Shea tweeted: "Holborn station evacuated and firemen taking control of surrounding areas."
Mohammed Seedat said: "Holborn underground station evacuated."
The station reopened about half an hour later at 3pm.
British Transport Police said: "Holborn station briefly closed whilst @LondonFire responded to a fire alert.
"No fire and the station will reopen. Thanks for your patience."
