EUSTON Station was closed this morning after two people were injured in a "serious assault" on-board a train.
Armed cops raced to the busy transport hub in London just after 7am following reports of an attack.
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Euston Station has been closed after two people were injured in a "serious assault" Credit: Alamy
All trains in and out of the station were suspended - and dozens of trains on the West Coast main line cancelled.
Dramatic images from inside the train show armed officers gathered on the platform.
A British Transport Police spokesman said: "‘British Transport Police were called to Euston railway station at 7.09am today (8 July) following reports of a serious assault on-board a train.
"Specialist officers were deployed, and a man has been arrested on suspicion of grievous bodily harm and conveyed to police custody.
"Two people have been taken to a local hospital for treatment to laceration wounds.
"Their injuries are not believed to be life-changing or life threatening."
'APPALLING INCIDENT'
The Rail, Maritime and Transport (RMT) union said the victim is one of its members.
RMT general secretary Mick Lynch said: "This is an appalling incident that will send shockwaves through the whole railway family, and our thoughts are with our member, his colleagues and his family this morning.
"While we await the full facts, the union will be providing practical support to our member and the workforce at Euston as the police investigation continues."
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One passenger on the train tweeted: "Train being held at Euston following violent assault on the adjacent train.
"Four heavily armed officers keep passing through the train searching for the aggressor, and nobody can leave the train."
The station has now reopened but travellers have been told to expect delays.