Commuters are facing disruption on the Central line this morning, with severe delays on the entire line due to an earlier faulty train.
Transport for London said a faulty train was being taken out of service at Mile End, meaning some customers may "experience a slight gap in service". Tickets will be accepted on local buses.
There is disruption on the District line due to an earlier signal failure. Although the issue has been resolved, TfL warned that trains and platforms may still be busy.
Meanwhile, there are also minor delays on the Waterloo & City line, due to an earlier faulty train, and on the DLR, due to a signal failure.