British Transport Police have released CCTV images following a violent attack on the northern line.
A man in his early 20s was hit at around 11.50pm on Saturday, February 29, as the train travelled between Oval and Kennington. He suffered a fracture to his face.
It is believed to have been a homophobic or transphobic attack.
Officers would like to speak to the men in the images (below) who may have information that could help their investigation.
Anyone with information, or who can identify the men, pictured, should text British Transport Police by texting 61016 or calling 0800 40 50 40.
Alternatively, to remain anonymous, contact Crimestoppers on 0800 555 111.