Arrest made after police officer punched in face on District line train
The incident happened on a District line train at around 7.50am on January 23.
Two men began to argue on the westbound service between South Kensington and Gloucester Road.
This was reportedly followed by one of the men punching the officer on the left side of his face.
A man in his 20s was arrested at the scene on suspicion of assault causing grievous bodily harm, assaulting an emergency worker and possession of a Class B drug.
Police are now appealing for witnesses to the incident.
A British Transport Police spokesperson said: “Did you witness the incident, or do you have any information which could help the investigation?
“Anyone with information can contact British Transport Police by texting 61016 or calling 0800 40 50 40 with the reference 2500008658.
“Alternatively, you can contact Crimestoppers anonymously by calling 0800 555 111.”