Police have released CCTV footage of a "savage" attack on a homeless man, which has left him with possible life-changing injuries.
We warn you: the video contains violent images that may be distressing to watch.
The incident took place in Manchester city centre early on Saturday morning, when the offender became involved in an argument with the homeless man.
The video shows the assailant hitting the 58-year-old victim in the head with a crutch, then kicking and stamping on him.
Detective Constable Paul Wilde, of Greater Manchester Police, said: "This was a savage attack on a vulnerable man that has left him with possible life-changing injuries.
"This happened in the early hours of the morning in the city centre when people would have been going to work and seen something. I would urge anyone who was in the area at the time or saw anything that can help our investigation to contact us."
Anyone with information should call police on 101, quoting incident number 558 of 15/10/16, or Crimestoppers, anonymously, on 0800 555 111.