Nassau County police arrested a Franklin Square man early Saturday morning after he allegedly beat a man in Elmont and then attempted to run away when a responding office tried to apprehend him.
Detectives said a Fifth Precinct officer was responding to a 911 call for a car accident when he stumbled upon a fight on Hempstead Turnpike just after 4 a.m.
The officer observed 26-year-old Jhonfi De Los Santos Martinez allegedly striking a 22-year-old male victim in his lower back, police said. As the officer approached the two men, De Los Santos Martinez dropped a knife but continued punching the victim in his face, police said.
The officer attempted to separate the two men, but De Los Santos Martinez pushed him and ran north on Elmont Road, police said.
The officer, with the help of help two other officers, was able to apprehend him after a short chase.
The knife was recovered at the scene, police said.
The victim was taken to a local hospital and was treated for a stab wound to his back, police said.
De Los Santos Martinez was charged with second-degree assault and possession of a dangerous weapon. He will be arraigned Saturday at First District Court in Hempstead.