A group of teen girls punched and stabbed a woman during a clash on a Brooklyn train this week – the same day another female straphanger was placed in a headlock and robbed in Queens, police said. 

In the earlier incident, a 27-year-old woman was riding a Queens-bound A train pulling into the Franklin Avenue station around 3:30 a.m. Monday when the group of four teens approached her, cops said. 

The woman got into a dispute with the crew, who then punched her, flashed an “unknown sharp object” and stabbed her in the head and shoulder, authorities said. 

The woman was taken to the Kings County Hospital Center, where she was listed in stable condition. 

The young suspects took off after the attack and have not been caught, police said. 

Photos released by the NYPD late Tuesday show all four suspects passing through the turnstile on their way out of the station.

In a separate incident hours later, a 24-year-old woman was violently robbed on a Queens subway platform, police said. 

The woman was standing on the northbound platform at the Elmhurst Avenue subway station around 11 a.m. Monday when a stranger placed her in a headlock from behind, cops said. 

The suspect then snatched the victim’s cell phone and ran off, authorities said. 

The victim refused medical attention for minor injuries. 

The suspect, also seen in a photo released late Tuesday, was last seen fleeing from the station on foot. 

The mugger, described as having a dark complexion, is described as between 25 and 30 years old, standing around 5-foot-11, and weighing around 170 pounds. 

He was last seen wearing a black T-shirt and light-colored jeans.