British Transport Police have released CCTV footage of a man slapping a Tube employee in the face in an attempt to trace the attacker.
Investigators have made video footage of the assault public after an initial appeal for information uncovered no leads.
On March 29, two men were walking from Totteridge and Whetstone station platform through the ticket hall at 8.30pm when they approached the member of staff at the ticket barriers.
One man used his Oyster card to pass through, before the other man began to confront the London Underground (LU) staff member.
The man then lashed out at the woman, slapping her in the face, before both men ran off through the barrier and out of the station.
One of the men, Edmund Hammond, 37, is believed to live in Tottenham, but may have links to Barnet, Colindale and Edgware.
Detective constable Steve Ajayi said: “This was a completely unprovoked attack and left the victim with bruising to her cheek and nose, not to mention causing her considerable shock and emotional distress.
“Members of staff should be able to go about their daily routine without the fear of violence like this. Our investigation is continuing and I’d appeal for anyone who recognises the men in the CCTV footage, or know the whereabouts of Hammond, to come forward.”
Aidan Harris, LU workplace violence unit manager, said: “This was an unprovoked and cowardly attack, and I urge anyone with information to contact the police immediately.
“Our staff have the right to carry out their vital work without fear of being attacked and we will always seek the harshest penalty possible through the courts.”
