At Least 4 Dead and Dozens Injured in Downtown Seattle Bridge Crash

A Duck Tour vehicle collided with a charter bus on the Aurora Bridge.
1:24 | 09/25/15

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Transcript for At Least 4 Dead and Dozens Injured in Downtown Seattle Bridge Crash
Three of them are catholics. The crowd asked to hold their applause until the end, but 34 times we could count, breaking the rule.first, when the pope said this. In the land of thee and the home of the brave. To thunderous applause, but there were at times half the chamberapplauding, the other half silent. And ABC's terry traveling with the pope, explains why. Know, veered out of control and we hit this bus here. Reporter: Tonight, at least four are dead. All exchange students. And more than 44 others injured, nine of them critically. The duck vehicle, an amphibious tour bus seen in cities around the country, appears to have speared the charter us. Though it's unclear who was at fault. 90 firefighters swarmed the bridge, climbing through a gapping hole in the side of the tour bus, frantically Wheeling gurneys to dozens of ambulances. Most of the injured were on that bus, which was ripped open in the collision. We have proximately 30 what we term also walking wounded. Reporter: Some witnesses seem to think the duck vehicle may have had some kind of problem, right before the crash. Just shot across all three lanes at full speed, no brakes, no nothing and hit the side of that bus. Reporter: Those duck boat operators drive and call out a tour at the same time. The ntsb will be investigating. They will be looking at the road here, which is pretty narrow. And also, the conditions of the vehicles to see if there might have been a mechanical problem that caused all this. David?

This transcript has been automatically generated and may not be 100% accurate.

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