A signal problem at London Bridge means trains are cannot run through the station, extending journey times by at least 30 minutes.
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- Trains are being diverted via Elephant & Castle and are not calling at London Bridge
More top news
Donald Trump is to visit the UK on July 13 and hold bilateral talks with Theresa May, Britain's ambassador to the US has said.
The Football Association has announced it has received an offer to buy Wembley Stadium.
The most hotly-tipped date is July 13, following the Nato summit which the president is due to attend in Brussels on the previous days.