Footage of teenagers in Preston threatening a homeless man with a knife and then burning his sleeping bag went viral last week, just days before yesterday's brutal attack on Igor Gieci.
Police were investigating the video, and arrested several people from the city.
Officers were also trying to find the man, who was sleeping in the Market Car Park when he was attacked on Saturday, September 8.
In the disturbing footage, a group of youngsters were seen hurling vile, Yardie-style slurs and threats before cackling with laughter as the elderly rough-sleepers possessions are torched.
Homeless charity boss Jeff Marsh, of the Foxton Centre, said: “Unfortunately homeless people are vulnerable to attacks in the streets.”