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Rail passengers have been facing severe delays on the high-speed line between Gravesend and Stratford International.
Southeastern said the delays are because of a "trespass incident" near Ebbsfleet International this afternoon.
Services running through Gravesend, Dartford, Ebbsfleet and Stratford Inetrnational were delayed at short notice, a spokesman said.
It said the lines re-opened at about 1.30pm, but delays were expected to continue as the backlog cleared.
Kent Police and British Transport Police officers are said to be at the scene.