Transport for London told London Tonight that there was"no tunnel collapse...There was a small defect in a tunnel wall, which was hit by a tube train", no injuries have been reported.
London Fire Brigade have now left the incident.
Severe delays are occurring on the Bakerloo Line as a result.
LBC reported that the RMT said the problem has happened between Embankment and Waterloo.
The London Fire Brigade were in attendance, as well as the London Ambulance Service, although it is not thought that they were needed.