Police in Arizona have released video showing an officer intentionally running over a suspect in his car, triggering new questions about what critics call excessive use of force by officers in the US.
In the dashcam video released yesterday, a gunshot is heard before suspect Mario Valencia is seen walking down a street in the town of Marana on 19 February with a rifle.
He is seen firing a shot in the air and then proceeding down the street as police slowly trail him in their vehicles.
A police car driven by officer Michael Rapiejko is caught on the dashcam rushing past and slamming into Mr Valencia from the back before crashing into a cinderblock wall.
Mr Valencia survived the collision.
Marana police chief Terry Rozema defended the action, saying Mr Valencia had refused to obey officers' commands to put down the rifle and was approaching an office building.
"We can't allow him to get to the point where he enters the office complex. We can't allow him the opportunity to take somebody in the parking lot hostage to do a carjacking."
"It's graphic, it's violent, but at the same token it warranted deadly force given all of the circumstances," he said, adding that the police officer "would have been completely justified in shooting this individual."
Warning: Graphic content
The dramatic incident capped a crosstown crime spree, according to police, who say Mr Valencia was fleeing from a Walmart store where he had stolen the rifle.
An investigation is under way to see whether he is also linked to earlier crimes in Tucson.
However, the violent encounter was only the latest in a series of incidents that critics say demonstrates a pattern of police brutality and racism across the United States.
Hundreds of people in two dozen cities, including New York, Los Angeles and Chicago, held protests yesterday over fresh police killings of unarmed black men.
Rally organisers say US police have shot more than 90 unarmed people since January.
On Monday, a white volunteer deputy sheriff in Oklahoma was charged with second-degree manslaughter for shooting dead Eric Harris, 44, a suspect in an undercover gun-sale operation. He is now free on bail.
Last week, a South Carolina police officer was charged with murder after being filmed on video killing Walter Scott, an unarmed black man, as he fled a routine traffic stop on 4 April.
The cellphone video shows the officer firing eight times as Mr Scott was running away.
A series of killings last year of unarmed black men by mainly white police officers have sparked nationwide protests and raised charges of racism, reviving a national debate about the excessive use of police force.
The demonstrations were galvanised by the August 2014 police shooting of 18-year-old Michael Brown in Ferguson, Missouri in bitterly disputed circumstances.
The officer involved in that case was not charged.
