A sinkhole has caused major disruption for commuters in and out of the capital for the second time in less than three weeks.
Thousands of people travelling into London Bridge were hit by long delays after the 30cm hole emerged under a train track at Forest Hill.
Rail operators have closed lines running into London Bridge and cancelled a number of services as a "safety measure".
Disruption on affected lines, including London Overground, Thameslink and Southern Rail, is expected until 6pm.
At around 3am this morning we were alerted to a small hole, around 30cm across, which appeared on the railway in the Forest Hill area.
Southern Services unable to stop at Norwood Junction, Anerley, Penge West, Sydenham, Forest Hill, Honor Oak Park, Brockley, New Cross Gate
London Overground services affected between New Cross Gate and Crystal Palace
Thameslink trains from Brighton into London only able to run as far as Gatwick Airport
Last month, commuters were advised to avoid using London Bridge after another sinkhole under the tracks at Forest Hill was discovered.
This morning, travelers took to social media to express their frustration at the latest rail disruption.
A Twitter account called Forest Hill Sinkhole warned travelers: "I'm back".