Police are trying to trace a Tube passenger who jumped onto live tracks at Tottenham Court Road in London to pull a fallen man to safety, despite the danger to his own life.
The daring rush-hour rescue happened after a 47-year-old man waiting for the Northern Line suddenly became unwell.
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"As shocked bystanders looked on, a backpack-wearing commuter jumped onto the tracks and hauled the man to safety," reports the Huffington Post.
Fellow travellers notified station controllers in an attempt to slow down the approaching train, adds the website.
The man, whose actions were captured on CCTV, has been hailed a hero for his quick-thinking and fast response.
The rescued commuter was treated by paramedics at the scene before being taken to hospital. He received only light cuts and bruises and will make a full recovery.
"Going onto the tracks is extremely dangerous, but the bravery of this man has to be praised," said Superintendent Chris Horton, of British Transport Police.
"The man sprung to the rescue and hauled him back onto the platform, whilst other commuters alerted the emergency services."
Police want to find the man in order to recognise him for his courage.
"On behalf of everyone at British Transport Police, I'd like to commend this man for his brave actions – his quick thinking most likely saved the man's life," Horton added.
People on Twitter were also quick to praise the man, with many hoping he comes forward to claim a reward.