Commuters heading home from work have been hit by delays after trespassers were found on the tracks at Brockley.
National Rail reported multiple people on the tracks and all services were at a stand still while it was being investigated.
A trespasser has been detained and trains are back on the move, but services have been altered as a result.
Delays are in place between London Bridge and Norwood Junction in both directions.
The disruption is expected to continue until 6pm today (December 20).
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