An investigation is underway after a major London train station was closed after reports of a "suspected gas leak".
Farringdon railway station was evacuated after a "small number" of passengers complained of feeling ill on Thursday morning.
British Transport Police were called to the scene along with paramedics and firefighters.
A spokesperson for the force said: "Officers were called to Farringdon station at 9.42am today (30 April) following reports of a suspected gas leak in the station, with a small number of passengers reporting feeling unwell.
"Officers are in attendance, alongside the ambulance service and the fire brigade, and the station has been evacuated while enquiries are conducted."
London Fire Brigade said it was responding to the incident. It wrote, in a posting on X: "Two fire engines, two fire rescue units and specialist officers are in attendance.
"The Brigade is working alongside partners at the scene. People are advised to avoid the area at this time."
The station has since reopened, and Elizabeth line and Thameslink have resumed services.
But National Rail said that "services are still heavily impacted" and "major disruption is expected" on Thameslink until 5pm.
Passengers have been advised to "allow a minimum of 60 minutes to your journey time as you may need to use an alternative route for at least part of your journey".
Tickets can be used on alternative London Underground, rail and bus services.
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(c) Sky News 2026: London station evacuated after 'number of passengers complained of feeling ill'
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