"Chris McColgan, 26, lives a couple blocks west of crash. ... [He] said he was driving west on Broad Street, stopped at the light on John Street, just two cars ahead of where copter came down.
"Because he was stopped at light, he saw the helicopter fall from the helipad atop the KOMO building."
At least two videos from the scene have been posted. As you can see in this one, flames spread down the street as fuel spread. According to KOMO News, "fire crews were able to extinguish the flames within a half-hour. Traffic was diverted from the area."