Police say it was "sheer luck" nobody was hurt after a man started a fire on a double decker bus.
The route 273 bus was parked outside Euston railway station when a man started a fire on the top deck at around 2.30pm on June 12.
Officers have carried out a number of enquiries since the incident.
The Metropolitan Police have now released an image of a man they would like to speak to.
Detective Inspector Jonathan Potter, from the Roads and Transport Policing Command, said: "This was an extremely reckless act which could have resulted in somebody being seriously hurt. It was sheer luck that there were no injuries.
"I would urge anyone who recognised the man in the image to contact us immediately."
Can you help? Call 101 quoting CAD 4378/03Oct. You can also share information online.
Alternatively contact the independent charity Crimestoppers anonymously on 0800 555 111.
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