A trio lashed a 13-year-old boy with belts before ripping off his sneakers in a vicious Brooklyn mugging last week, cops said.

The group – two men and a woman – approached the youngster around 3:15 p.m. Friday at 17th Street and Fourth Avenue in South Slope and struck him with belts multiple times before pulling his kicks straight off his feet, police said.

The trio then fled into the nearby Prospect Avenue train station, where they hopped on a Manhattan-bound R train, authorities said.

Police released surveillance photos of all three suspects late Monday. They had not been caught as of Tuesday.

The female is described as having a dark complexion and red braids. She was last seen wearing a pink hooded sweatshirt, black jacket, black pants, and black sneakers.

One of her male companions, also described as having a dark complexion, was last seen wearing a gray hooded sweatshirt, dark blue jacket, dark blue pants, and white sneakers.

The third suspect, who sported short braids, also had a dark complexion and was last seen wearing a blue and black jacket, black Adidas track pants, and gray sneakers.

The victim refused medical attention for his injuries, police said.