An inquiry has been launched after the doors of a London Underground train were opened by the driver in error as it approached a red signal.
The southbound Victoria Line train was coming to rest in a tunnel outside Brixton station, south London, when the doors opened.
Transport for London (TfL) said the doors were immediately closed again.
It added that the driver confirmed the incident on Wednesday evening was the result of human error.
A TfL spokesman said: "London Underground has launched a full investigation after a southbound 67-stock Victoria line train approaching Brixton on Wednesday evening unexpectedly opened its doors as it came to rest at a red signal.
"The train was checked following the incident and no customers were affected."
Services were delayed by about five minutes as a result.