According to a video posted Friday, a police officer was investigating the shooting of a car and killed the 14-year-old suspect while the boy fled, according to a video posted.
Before taking pictures of the officer's camera, carried by the officer's body, the Tempe police chief, Sylvia Moir, asked the people to retain the trial.
"I must begin by expressing my condolences to the young man's family, the loss of his life is tragic," Moir told a news conference. "I'm very sorry for your loss."
Police say the boy, identified by his family as Antonio Arce, was carrying a replica gun when a policeman shot him on Tuesday, only identified as Officer Jaén.
In interviews and a vigil this week, family members have asked for justice.
The video of the body's camera shows Jaén arriving in a car and parking in an alley in a reported robbery. He sees the suspect in a gray van in front of his patrol car and crouches behind a large black plastic garbage barrel.
"Hey," Jaén says and raises his pistol as the suspect leaves the pbadenger side of the truck and begins to run down the alley bordered by a wooden fence, a link in the chain and a block of concrete.
"Let me see your hands," Jaen screams and fires two shots while the suspect flees.
"A shot fired, a shot fired," the officer yells as he chases the teenager through the alley.
"He has a gun, he has a gun," Jaen shouts later.
The video does not show the suspect again after he disappears from sight.
It is impossible to know if the suspect carries a gun, but it seems he is holding something in his hand in an enlarged still photo that the department took of the video and showed at the press conference.
Moir said that one of the two shots hit the teenager in the back area of the scapula and the other hit a wall. She said that two independent witnesses reported seeing the suspect running down the alley with a gun in his hand, and a replica gun was found on him. Police said the replica of the gun was taken out of the vehicle with other items.
Arce died in a hospital.
The chief of police said that Jaén has been an officer for 17 years, 14 of them in Tempe. It was placed on administrative license. Jaén completed a combat trip in Iraq for the national army guard.
Arce's Facebook page showed pictures of a baby-faced child with a peach mustache and some images with family and friends. The friends were putting together a GoFundMe page to pay for funeral expenses.
On Thursday, a vigil was held in front of Tempe police headquarters. The department said it will carry out its investigation along with prosecutors, which is common in officer shootings.
Since the beginning of the year, there has been at least one other police shooting that killed a teenager in the largest county in Arizona. Earlier this month, a Phoenix police officer shot and killed Jacob Michael Harris, 19, after security agents saw him, along with three others, on an armed robbery. The police say they were watching the group because they were suspected of several other robberies.
Also this month, an officer in the suburb of Peoria, Phoenix, shot and injured a 17-year-old boy after receiving a call about a robbery at an auto supply store. The officers said that the boy had a gun. He was shot in the shoulder.