It happened Tuesday morning just outside the Seattle Center near the famous Space Needle.
The news helicopter crashed on a busy street in Seattle, slamming into at least two vehicles.
"When he went to take back off, the sound of the helicopter change drastically. And I looked, and the helicopter was almost immediately pitched off and off balanced. And it kind of nosed over trees and clipped the tops of the trees and crashed just on the other side of the street there," said witness Bo Bain.
Huge flames and plumes of black smoke poured from the burning wreckage. Fuel from the crash scene burned for a block.
KOMO-TV confirmed it's their news helicopter and may have hit the side of the building during takeoff from the station's 5th floor helipad.
The Seattle Fire Department said two people onboard were found dead in the wreckage. A 38-year-old man who was in one of the cars struck by the helicopter was taken to a hospital in critical condition.
"The person in red car was able to self-extractate and made it to the middle of the street and was taken with burns to his body," said Seattle Fire Department spokesman Kyle Moore.
Traffic was diverted, and firefighters extinguished the flames within a half hour.
Officials say the investigation into the crash could last three to five days.