A Tube passenger has been sprayed in the face and seriously assaulted in east London. The attack happened on Sunday night after an argument broke out at Debden station.
The attack left the 31-year-old victim with a serious injury to his knee, as well as cuts to his face and head.
Police have released CCTV images of two man they want to speak to.
Anyone with information is asked contact British Transport Police on Freefone 0800 40 50 40, or text 61016, quoting incident reference LUA/B6 of 20/02/14. Alternatively call the independent charity Crimestoppers, anonymously, on 0800 555 111.