Tube travellers were stuck underground tonight after a power cut hit London.
London Underground said the power failure was having a "serious" impact on the whole of the network. Rail services from major stations including Victoria,London Bridge and Waterloo were also affected.
A Tube spokesman said: "There has been a National Grid failure which has affected the underground. At the moment we are assessing the impact of that butit is having a serious impact on the whole system at the moment."
He added: "It's also having an affect on some of our buildings. Certainly quite a lot of the network appears to be affected."
He said the failure happened around 6.15 p.m. and there were likely to be a number of people stuck underground.
He added: "There will be travellers underground. I don't know the extent of that yet. It's at the end of rush hour, the peak period, so it's a busy time."
A spokesman for electricity network operator EDF Energy said: "We have lost supplies to large parts of south London in the last few minutes as a result of a National Grid failure supply in the south London area.
"It's difficult to predict how long this is going to take. National Grid has got to get the circuit back."
PA