Viewers did not witness the crash during the coverage of the chase
The crash aftermath
Both helicopters went down in Steele Indian School Park in Phoenix, Arizona, and caught fire as they were covering the police pursuit of a pick-up truck.
Everyone on board the two craft was killed. No-one on the ground was hurt.
Within moments of the collision, other TV news helicopters were broadcasting pictures of the burning wreckage.
Viewers did not see the accident as both cameras were pointed towards the ground.
Police pursuits are fertile material for many US TV stations and have proved popular with viewers. In Los Angeles, a service exists whereby viewers, in return for a monthly subscription, are paged every time a pursuit is being shown.
Broken images
As a driver led police on a high-speed chase through Phoenix, helicopters from five local TV stations were covering the incident live.
I looked up and I see this 'boom', and I see one of the helicopters coming down
Mary Lewis
As the cameras zoomed in on the action, KNXV news reporter Craig Smith, who died in the collision, said "Oh geez!" and the screen went blank.
Viewers caught a jumble of broken images before the stations cut back to the studio.
Mary Lewis, who saw the incident, said: "I looked up and I see this 'boom,' and I see one of the helicopters coming down, and I said 'Oh my God'."
The two helicopters crashed to earth near a boarded-up church in Steele Indian School Park.
Fire fighters rushed to the scene as thick, black smoke rose from the burning wreckage.
The driver involved in the car chase was later detained by police after he had barricaded himself inside a house.
'Very professional'
The local TV station KNXV, the ABC affiliate in Phoenix, said it owned one of the helicopters while the other was operated by the local independent channel, KTVK.
The president of the Radio Television News Directors Association, Barbara Cochran, said she could not recall a previous incidence of two news helicopters colliding whilst covering a story.
"These pilots, they are very professional. They combine the skills of pilots and skills as journalists," she told the Associated Press.
Aerial view of Phoenix, Arizona. Map of the United States, highlighting Arizona
Four people are dead after two news s crashed in Phoenix, Arizona, in the United States. The helicopters were covering a high-speed chase within the city, when, at the same time as the suspect left his car in order to carjack another car, the two choppers inadvertently crashed into each other. Wikinews has learned that the two helicopters belong to independent TV station  (Channel 3), and ABC affiliate  (Channel 15).

There is still no word on an exact cause of the collision, however, the  is reviewing tapes to see if the helicopter pilots were communicating with air traffic controllers at the time.

On a tape of radio transmissions from the Channel 15 helicopter, pilot Craig Smith (of KNXV-TV) can be heard asking, "Where's 3? Like how far? Oh jeez", followed by "3, I'm right over you. 15's right over you."  Moments later, the sound of the crash was heard over the air on Channel 15's signal, which then went to static.