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Commuters have been warned to expect delays on their journeys back to Dartford after police were called to a disturbance on board.
According to Southeastern, officers were called on board at Albany Park, with the train on the Sidcup line.
They reported some delays on the line as a result, but now say the incident has been dealt with.
The company says that normal services should resume shortly.
Meanwhile on social media it has been reported that the disturbance involved fighting youths, some of whom may have had knives.