The NYPD said the suspects, both armed with razor blades, attacked the woman at Lenox Avenue and West 116th Street at 6:05 p.m. Monday night.
During the robbery, the victim - a 32-year-old woman - was slashed across the face and upper body with a razor.
She sustained a laceration to the right side of the cheek and her nose. She was treated at St Luke's Hospital. Her cellphone was stolen during the ordeal.
The suspects, identified as 39-year-old Jameelah Harrison and 31-year-old Dashonia Harrison, fled northbound on Lenox Avenue in a black Chevy Suburban.
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The NYPD said the victim knew her attackers.
Anyone with information about the suspects is asked to contact the NYPD at 1-800-577-8477.
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There has been a recent series of slashing incidents across the city. Here is information about the others:
* 2/21 | Williamsbridge, Bronx | NYPD officer slahsed while responding to fight
* 2/21 | Morrisania, Bronx | Man slashed in face while walking on street
* 2/18 | SoHo, Manhattan | Man slashed in face during attempted robbery
* 2/17 | Greenwich Village, Manhattan | Server needs 120 stitches after slashing
* 2/16 | Washington Heights, Manhattan | Cab driver slashed in face during fare dispute
* 2/12 | Van Nest, Bronx | 20-year-old woman robbed, slashed while walking home
* 2/7 | East Tremont, Bronx | Man slashed in cheek after dispute at subway station
* 2/2 | Williamsburg, Brooklyn | 18-year-old slashed while walking home
* 2/2 | Parkchester, Bronx | 65-year-old businessman slashed during robbery
* 2/2 | Harlem, Manhattan | Man slashed in face during attempted robbery
* 1/31 | Harlem, Manhattan | Man slashed during attempted robbery on C train
* 1/25 | NoHo, Manhattan | 71-year-old woman slashed while riding D train
* 1/16 | East Village, Manhattan | 30-year-old man slashed while walking down the street
* 1/14 | East Tremont, Bronx | Man gets 100+ stitches after slashing attack
* 1/6 | Chelsea, Manhattan | 24-year-old woman slashed while walking to work
* 12/30 | East Side, Manhattan | Employee, customer slashed inside McDonald's
* 12/16 | Crown Heights, Brooklyn | Man slashed in the face coming out of subway station
* 12/16 | Whitestone, Queens | 16-year-old exchange student slashed in throat
* 11/5 | Bedford-Stuyvesant, Brooklyn | 2 slashed in head aboard C train