Commuters are facing disruption at two of the capital's busiest stations this morning, London Bridge and Paddington.
National Rail said a passenger alarm was pulled on a Charing Cross train as it was approaching London Bridge because of a person taken ill on board. This blocked the line towards London Bridge while the driver went back to investigate.
Train services running to and from London Bridge may be delayed by up to 25 minutes or revised. Disruption is expected until 11:30am.
Meanwhile, there are also delays on services in and out of London Paddington. National Rail said a fault with the signalling system between Southall and Ealing Broadway is causing disruption to journeys to and from Paddington. This is expected to continue until 11:45am.