The police believe the same red-haired robber is behind four robberies in Manhattan since Sunday. In some of the incidents, the suspect has slashed or attacked the victim.

Here are details from the NYPD:

Incident #1: On Sunday, January 31, 2016 at approximately 2030 hours, while on board the northbound C train in the vicinity of St. Nicholas Avenue and West 155th Street, an individual approached the 22-year-old male victim, displayed a knife and demanded his cellphone. The individual cut the victim's right arm causing a laceration to his hand and fled the location empty handed. The victim was treated and released from Columbia Presbyterian Hospital.

Incident #2: On Tuesday, February 2, 2016 at approximately 0300 hours, while on the northbound #4 train in the vicinity of Utica Avenue, a 37-year-old male victim was asleep when he awoke to an individual standing over him with a razor in his hand. The victim noticed a cut in the pocket of his jeans, attempted to restrain the suspect who punched the victim in the face causing swelling to his left eye. The suspect then fled on foot without the victim's property.

Incident #3: On Wednesday, February 3, 2016 at approximately 1914 hours, inside of Spring Iconic Sweet Shop located at 203 Spring Street, an individual entered the location, removed two bags of chips and attempted to leave the store without paying. A 39-year-old male employee attempted to stop the individual and struggled with him causing him to fall. The victim sustained pain to his leg and a small laceration to his finger. The suspect fled on foot westbound on Spring Street with the chips.

Incident #4: On Wednesday, February 3,2016 at approximately 1950 hours, on the northbound C train, an individual grabbed an iPad from a 28-year-old female's hand and fled outside of the station on foot in an unknown direction. There were no injuries as a result of this incident.

The suspect is described as being in his 20s, is 5'10", 150 pounds and has red hair, and was last seen wearing a black hooded sweatshirt and black pants, with a chain around his neck. The authorities release a photograph from the third incident.

Anyone with information in regards to these incidents is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782). The public can also submit their tips by logging onto the Crime Stoppers website or by texting their tips to 274637 (CRIMES) then enter TIP577.