Video: 54-year-old man surrounded, attacked in the Bronx

New video shows the moments a 54-year-old man was surrounded and attacked in the Bronx last month. 
The incident happened at a residential building near Townsend Avenue and East 172nd Street. 
Police say four men attacked another man, ganged up on him and stabbed him in the back on Sept. 10. 
Surveillance video from the NYPD shows what they say is four suspects coming up to the 54-year-old victim at around 6 p.m. 
Officials tell News 12 one of those suspects had a knife and stabbed the victim in the side, before he was able to grab the knife himself--causing the four attackers to run away. 
Police released a photo of one of the suspects who had the knife, describing all four of them as men between the ages of 18 and 20 years old. 
All of them are still on the run at this time, according to police. 
The 54-year-old victim was taken to the hospital and is in stable condition.