The second suspect has been identified as 19-year-old Llonnie Dempster of the Bronx.
Dempster is about 6 feet tall, 180 pounds. He has been seen wearing a bubble jacket, fisherman's hat or knitted cap.
Authorities say a man hailed a cab on Sept. 18, and then assaulted the driver and demanded money when the cab arrived at his destination. On Sept. 20, police say the suspect tried to do the same thing to another cab driver and stabbed him in the back when the driver tried to get away. The driver suffered minor injuries.
On Sept. 23, the suspect and another man assaulted another driver after taking a ride. Police say they fled with money and the cab's security camera.
Anyone with information in regards to any of these incidents is asked to call Crime Stoppers at 1-800-577-TIPS (8477). You can submit tips by logging onto the Crime Stoppers website at www.nypdcrimestoppers.com or by texting tips to 274637 (CRIMES) then enter TIP577.