Police have released footage they say shows a teenager pulling a gun from his waistband moments before he was shot by officers in Ferguson, Missouri.
Tyrone Harris Jr was critically injured when he was shot on Sunday night as demonstrators marked the one-year anniversary of Michael Brown's death.
Harris allegedly opened fire on an unmarked police van and a gun battle with police ensued.
The 18-year-old remains in a critical condition in hospital.
He has been charged with 10 felonies - five counts of armed criminal action, four counts of first-degree assault on a law enforcement officer and a firearms charge.
St Louis County Police say the 13-second video from a security camera shows Harris grabbing the gun in response to shots being fired during the protests taking place nearby.
Police Chief Jon Belmar has said the officers who shot Harris suspected he was armed and had been keeping an eye on him during the protests.
At one point, Harris allegedly approached the police vehicle and opened fire, Chief Belmar said. The officers then returned fire and pursued the suspect on foot.
Harris' father, Tyrone Harris Sr, told the AP news agency on Monday the police version of events was "a bunch of lies".
He said his son had been drawn into a dispute involving two groups of young people and was unarmed when the officers shot him eight to 12 times.
"My son was running to the police to ask for help, and he was shot," Mr Harris said. "It's all a bunch of lies ... They're making my son look like a criminal."
