A 17-year-old boy shot this week while robbing a woman in Chinatown was arrested at Northwestern Memorial Hospital where he was being treated for his gunshot wound, according to Chicago police.



Police said the teen and another 17-year-old approached the 25-year-old woman from behind in the 2100 block of South Tan Court around 11:15 a.m. Tuesday. One of them displayed a silver handgun and they took her purse.



A man in the area fired a round toward the robbers, hitting the 17-year-old holding the gun, police said. Investigators have so far not been able to identify him.



Surveillance video shows the man firing at the robbers and the 17-year-old getting hit in the buttocks and falling. At that point, police said, the two robbers became separated.



One ran to the Red Line at Cermak Road, and officers arrested him on a train. He was charged with robbery with a firearm after police found the woman's property on him, according to authorities.



The wounded 17-year-old was arrested at Northwestern Memorial Hospital and charged with robbery by firearm and unlawful use of a weapon.