The newly released footage shows the suspect attacking a 26-year-old man at the West 4th Washington Square Subway Station in Manhattan at 4.17 am on October 2.
Video shows the men grappling before the attacked pulled out a knife and stabbed the commuter in the stomach, before fleeing. That victim was also brought to Bellevue Hospital, and is in stable condition.
The footage was released as news of another attack emerged on Monday on the southbound Number 1 train platform at the nearby West 28th Street station.
At around 11.30pm, a 23-year-old had a bottle smashed over his head after an argument with a fellow passenger.
The suspect had begun screaming at the victim 'why are you doing that?' before smashing the bottle into his head and bolting out of the station, the New York Post reported. It's not clear why he was shouting.
The victim was taken to a nearby Bellevue Hospital for treatment for lacerations on his face, neck and ear - he is expected to recover.
This week, NYC Crimestoppers released chilling footage of a man (pictured) attacking another random victim, a 26-year-old male, on October 2 around 4 am
The suspect followed the victim into the subway system near West 3rd Street and Sixth Avenue; the two 'engaged in mutual combat' before the attacker stabbed the commuter with a knife at the station's turnstiles, then fled
The victim of the random knife attack was brought to Bellevue Hospital, and is in stable condition
On Monday, NYPD Inspector Raymond Porteous told the Metropolitan Transportation Authority Board that there was an 'uptick in overall crime' within the city's subway system, according to CBSN New York.
He said there was a 58.6 percent increase in major crimes in September compared to August, including a shocking 88-percent increase in grand larcenies and a 50 percent increase in felony assaults.
There were 96 grand larcenies within the subway system last month compared to 64 in August and 55 in July, the New York Post reported. Smaller robberies jumped by 18 percent last month, too, to 52 incidents from 44 in August.
The glass bottle incident comes after a woman shoved a commuter into an oncoming train in Times Square earlier this month.
The victim, Liliana Sagbaicela, 42, was shoved from the platform and into the train as it approached the station in what is believed to be an unprovoked attack on October 4.
She was taken to a nearby hospital in stable condition after sustaining facial injuries.
There were 96 grand larcenies within the subway system last month compared to 64 in August and 55 in July, the New York Post reported. Smaller robberies jumped by 18 percent last month, too, to 52 incidents from 44 in August (robbery data for July was unavailable)
Throughout the city, felony assaults are up 7.7 percent from the same time