Trains running through Dover Priory have been affected by objects on the track.
Members of the public were spotted throwing items at the railway.
The items have damaged the track and trains can not run on the line until it is repaired.
Engineers are en route but services running via Dover Priory or Ramsgate through the station may be delayed, cancelled or revised.
Trains cannot run between Dover Priory and Ramsgate (via Deal) or to Canterbury East.
Southeastern confirmed the disruption is expected until 11pm and buses are being arranged.
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