UPDATE Wednesday, Oct. 11, 2017 4 p.m.

Investigators still don't know the motive behind a shooting that left one man dead and another injured in Powell.

At a press conference Wednesday afternoon, KCSO Major Mike MacLean said they have identified two persons of interest and impounded a black Mustang, but they have still not determined if they were involved in the incident.

Investigators have determined that while the black Mustang chased the white Sebring for several miles on Clinton Highway and Emory Road, shots were only fired at the end, in about the last 500 yards before the car came to rest.

Several other vehicles were hit by bullet fragments, but no one else was injured,

The sheriff's office praised the witnesses who came forward and spent time telling investigators what they had seen, and encourage anyone else with information to come forward. They are particularly interested in hearing from any businesses who may have surveillance cameras that could have gotten video of the vehicles as they were driving on Clinton Highway or Emory Road.

Sgt. MacLean said that the surviving victim, Lucas Halliburton, was "doing well." Investigators were able to interview him, and he said he did not know why anyone was shooting at them.

UPDATE Wednesday, Oct. 11, 2017 11 a.m.

The Knox County Sheriff's Office has identified the passenger who was critically injured in a shooting on Emory Road Tuesday.

The Knox County Sheriff's Office said a black Ford Mustang was chasing a white Chrysler Sebring from Clinton Highway near Powell Drive to the 2500 block of Emory Road around 6 p.m. Tuesday.

Lucas Halliburton, 20, was riding in a Sebring when the incident happened. He was transported to UT Medical Center in stable condition, according to the sheriff's office.

KCSO said the passenger in the Mustang was shooting at the Sebring with a handgun.

Rural/Metro officials said "multiple" gun shots were fired.

KCSO said 19-year-old Cameron Smith, the driver of the Sebring, was pronounced dead at the scene.

ORIGINAL STORY Tuesday, Oct. 10, 2017

A 19-year-old man is dead and a 20-year-old man is in critical condition after a shooting on Emory Road in Powell Tuesday evening.

The Knox County Sheriff's Office said a black Ford Mustang was chasing a white Chrysler Sebring from Clinton Highway near Powell Drive to the 2500 block of Emory Road around 6 p.m.

KCSO said the passenger in the Mustang was shooting at the Sebring with a handgun.

Rural/Metro officials said "multiple" gun shots were fired, and one person was taken to the hospital.

KCSO said 19-year-old Cameron Smith, the driver of the Sebring, was pronounced dead at the scene. The passenger, a 20-year-old man whose name has not yet been released, is in critical condition at UT Medical Center.

There was a heavy police presence on the scene near the Broadacres subdivision and Powell High School Tuesday evening, including several marked and unmarked cruisers, and at least one ambulance.

Witnesses on scene told 10News people driving nearby stopped and administered first aid to two people from the second vehicle.

The sheriff's office is still searching for the black Mustang, a 2006-2008 model, and the driver, a white male, and a black male passenger. Investigators have not identified a motive in the shooting.

Anyone with information about them is asked to call 865-215-2243.