The story

Eyewitnesses to the collision of two news helicopters in Phoenix, Arizona, in which four people were killed, told investigators they noticed no problems with either aircraft before the collision, a National Transportation Safety Board spokesman said Saturday.

Of the seven witnesses interviewed as of Saturday evening, none saw any pieces fall off the helicopters before the collision or noticed smoke or erratic movement by either aircraft, NTSB spokesman Steve Chealander told reporters. Witnesses also told the NTSB "go team" investigating the collision that they heard no change in the sound of the helicopter engines, Chealander said.

The helicopters were tracking a police chase through the streets of downtown Phoenix when they collided at midday Friday, crashing to the ground in flames and heavy smoke. Read full article »

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