A signalling problem is causing delays on Southeastern trian services between Cannon Street and London Bridge - with disruption expected to last until 7pm.
Southeastern said: "London Underground are accepting tickets for reasonable routes.
"The problem has been fixed but trains may still be diverted to run to/From Charing Cross, and services through London Bridge could be delayed by up to 40 minutes.
"Delays expected until 7pm."
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