The incident happened around 2 p.m. on Feb. 22.
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Police announced Friday that 16-year-old Edgar Garcia is in custody in connection to the shooting. NYPD Chief of Detectives Dermot Shea said Garcia is expected to be prosecuted as an adult.
"This is what this young girl is walking through ... I don't want to see that once in NYC. Period," he said.
Authorities say Garcia walked up to a group of people, pulled a gun and took aim at one of them -- a 19-year-old man. He fired three shots before taking off.
In video released by the NYPD this week, people on the sidewalk can be seen running or ducking for cover.
Man opens fire on busy Bronx street
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Another surveillance video obtained by Eyewitness News showed a little girl with a backpack walking home from school, right near where the gunman was shooting.
The terrified girl ran away and went toward the entrance of a building, but found the front door was locked. She is seen remaining by the side of a woman before someone finally opened the door.
"My heart dropped when I saw the little girl running for her life," said Awilda Cordero, a community activist who is haunted by the image of the little girl and the man firing shots.
"If he did it now and he didn't care, he'll continue to do it, so we need to get him off the street," said Cordero.
Fortunately, no one was injured in the incident. Police believe the incident stems from an ongoing dispute between two gangs.