There are severe delays on the Victoria line this morning, due to an earlier fault with the track.
Commuters may need extra time to access Finsbury Park, Stockwell and Victoria Underground stations.
"All is being done by our engineers on site to restore the service to good. In the meantime please continue to use alternative routes to complete your journey this morning. We'll keep you posted if anything changes," said Transport for London (TfL).
TfL has advised commuters to use alternative routes where possible and said tickets will be accepted on Greater Anglia, Great Northern, Overground, buses and South Western Railway between Vauxhall and Waterloo and on Southeastern between Brixton and Victoria.