More Trouble on the Tube
Emergency services have been called to three Tube stations after "incidents", Scotland Yard said.
Police confirmed they had been called to Warren Street, Oval and Shepherd's Bush stations.
There have been reports of smoke coming from the stations and all three have been evacuated.
The whole of the Northern Line has been suspended, along with the Victoria Line and the Hammersmith and City. One hospital has begun its emergency plan.