Blackfriars Underground station in London has been closed due to flooding.
Trains are currently not stopping at the station as investigations take place.
Great Northern earlier tweeted: "We have been advised just the underground station at Blackfriars has been closed due to flooding."
Transport for London said there had been a fire alert which was being dealt with.
TfL, in response to a customer's tweet, added: "There is currently a fire alert at the station and therefore is being dealt with accordingly by the appropriate people."
"The closure is due to a fire alert at the station, which is being investigated. We'll let you all know when the station reopens," the Circle and District line's Twitter accounts reported.
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London buses are accepting tickets in the meantime, the report says.
One Twitter user posted: "Blackfriars Station closed, fire engine just arrived."
A commuter said: "Got to Blackfriars, police outside and the station closed. That’s not good!"
One seemed to find a positive side to the closure, saying: "Blackfriars being shut tonight reminded me that walking through Central London can actually be a really nice journey, featuring St Paul's, Bank and Liverpool Street."
The commuter tweeted photos as he walked around the city.
