A commuter was smashed over the head with a hammer after refusing to give another man a cigarette at a London Underground station.
Horrified witnesses described the victim as 'being on his way to work' when he was 'whacked in the head' at Stratford Station, while another man was also assaulted in the fracas.
The offender was then tackled by other commuters, 'stamped on' and restrained until police arrived.
Officers arrested one person shortly after 6am while an ambulance and emergency response vehicle were also sent to the scene.
One witness told the Mirror: 'I came out of Stratford station and the (attacker) was drawing attention to himself with how loud he was being.
'He approached another person asking for a cigarette and the guy said 'no' and this person pulled a hammer out and just started hitting him.
'He was instantly tackled to the ground, stamped on and pinned down until emergency services turned up.'
Commuters who witnessed the attack also spoke of their shock on social media.
One Twitter user said: 'Whoah lively Tuesday morning some nutjob hit some innocent guy over the head with a hammer over a cigarette outside stratford station.'
Another said: 'Wow wow wow ... walk out of Stratford station to someone wacking man up with a hammer ... ffs over a cigarette too ...'
A Twitter user added: 'What just happens at #Stratford Station? One person was screaming and minutes later the police came.'
According to one witness there were six police cars, two police vans and an emergency response vehicle at the station.
A spokesman for British Transport Police confirmed a 26-year-old man was arrested and a hammer was recovered from the scene.
The spokesman said: 'Shortly before 6am this morning, officers were called to Stratford station in east London after reports two men were assaulted by a man in the station concourse.
'Police were quickly on scene and a 26-year-old man from East Ham was arrested on suspicion of actual bodily harm, common assault and possession of an offensive weapon.
'During the arrest a hammer was recovered. The man has been taken to police custody.
'Both have been taken to hospital for treatment to non-life threatening injuries. The first victim received a laceration to his head as well as a suspected fractured shoulder. The second victim is being treated for minor bruising.
'Inquiries are now underway to understand exactly what happened in the moments leading to both men being assaulted.
'If you were at Stratford station this morning and witnessed the assault, please contact BTP by sending a text to 61016 or by calling 0800 40 50 40 quoting reference 49 of 30/10/2018, or call Crimestoppers anonymously on 0800 555 111.'
This article has been adapted from its original source.
© Associated Newspapers Ltd.