Security cameras capture an officer involved in a fight for his life Saturday night-that officer ended up shooting and killing a teen who pulled a gun. Cincinnati Police released new information about the shooting during a news conference late Sunday afternoon, nearly 24 hours after the violent confrontation.

For nearly two minutes, officers struggled to control 16-year-old Davon Mullins. Cameras show the suspect pulled his gun. That's when the officer fired twice. The chief of police says the officer had no choice.

The investigation began at the Black Family Reunion. An off-duty officer reported seeing several people bringing guns into the event, and placing them together in a certain location.  Then he saw a second group of people pick up the guns, and walk into the business district. Officers say it appeared to be preplanned.

Officer Oscar Cyranek met the suspect at Fountain Square, right in front of the Fifth-Third Bank Building. Cincinnati Police Chief James Craig says, "The officer immediately asked Davon to stop. Davon refused."

Their confrontation is all caught on security cameras. To stop Davon from running, Chief Craig said the officer grabbed him and forced him against a wall. For one minute and 53 seconds, they wrestled, both trying to gain control. You can see the officer reach for his handcuffs but he's unable to put them on. Eventually the officer forced Davon into a seated position but he loses control of his right hand. Chief Craig says, "Davon held a 9 millimeter high point semi automatic hand gun. He was holding the weapon with his finger on the trigger."