A man who climbed onto the tracks at a Merseyside station was involved in a 90 minute stand off with police, causing major disruption.
Merseyrail said officers were involved in the "pursuit" of a trespasser at Seaforth and Litherland.
The incident led to severe delays on the Northern Line as services were delayed and, in some cases, terminated early.
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The dramatic scenes unfolded shortly after the station had opened, prompting trains travelling in both directions - towards Southport and Hunts Cross - to be stopped while attempts were made to resolve the situation.
Merseyrail reported this morning: "Due to a trespasser being pursued by the police earlier at Seaforth and Litherland the Southport and Hunts Cross line is disrupted."
The incident reportedly started at around 6am and the man was initially detained
on the tracks and then removed at around 7.30am.
Services resumed a short time later, but travellers on the Northern Line remained subject to delays beyond the morning rush hour. Merseyrail said normal service has now resumed.
The ECHO has approached British Transport Police for more details.
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