A number of trains have been cancelled or delayed by up to an hour, including two trains to Leeds, according to Northern.
They have said this evening on social media: “Due to passengers causing a disturbance on a train between Doncaster and Fitzwilliam the line is blocked.
“Train services running through these stations will be cancelled or delayed by up to 60 minutes. Disruption is expected until 18:30 27/05.”
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