One of the Tube's busiest stations was temporarily closed today after ticket office staff noticed a strange smell.
Trains continued to pass through Victoria Underground station but passengers were unable to get on or off at the central London stop.
Emergency services were called to investigate but after a series of tests declared that nothing hazardous was present.
The station later reopened.
A spokesman for British Transport Police (BTP) spokesman said: "Firefighters from the London Fire Brigade carried out tests at the station, which established that there were no hazardous substances present.
"It's not known at this stage what caused the smell and Transport for London (TfL) will investigate.
"A gas leak has been ruled out. The incident is being treated as non-suspicious."