Train derails in Washington state, leaving car dangling over highway

According to the Pierce County Sheriff's Office, there were 'injuries and casualties' in the incident but it was not clear how many or how severe.
3:02 | 12/18/17

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Transcript for Train derails in Washington state, leaving car dangling over highway
Series it looks like considered passenger car it yeah it is the third bout our onion. It is not our knowledge I don't like it or it. Collapsed sop. OK well we'll got seriously raises a couple of questions you have to wonder about the integrity. Of the overpass. As wells went to his that we don't know right now what led up to this. In the first place what the words whether structural or or humid air we have no idea at this point. Thurston County sheriff also tweeting just to be added. Baez of this massive incident involving a train derailing. On the mounts road overpass down onto I five. As you can see here as we've been telling you all morning that train is blocking I five avoid that area. And this falling valley be patient with traffic and emergency vehicles in the area WS he is investigating the incident. In case you're just joining us this now happened about one hour ago. When that train of Amtrak five O line. Fell down onto the roadway for one reason or another and we have learned there are injuries involved WSP. Is responding pierce county sheriff. Also sending out this information out on Twitter saying preliminary information derailed Amtrak passenger train was heading southbound. Injuries and casualties reported numbers succumbed once again we're still waiting get a firm number on how many people. May have been injured in this accident how many people were injured on the train as well as long interstate five if any those cars got crushed by that train falling down. As we heard from theater one of the eyewitnesses that called indicating the high I looked like it was the third passenger car that went off the side. Of that bridge and that overpass onto the freeway. You can count 123. The engine off off off the top off to the right hand side. This is the shots again you can see the engine that's one passenger car and then a third passenger car. That is the one that is dangling off the freeway. As all along I five this is happening once again near DuPont in pierce county shutting down interstate five. Yet just moments ago you saw we had that of that big map that was gonna zoom down giving you a bird's eye view. That area it was kind of hard exactly did pinpoint so I think our producers are now working on showing us exactly where on this map. It happened but I mean up and down by 5730. In the morning a very. Busy time and WST was telling us hey listen you have to avoid the area there are no easy alternate routes. Traffic is going to be a problem this is going to be closed. Forty really. Long time not only a dressing as you've mentioned act casualties and injuries that are involved also but the subsequent investigation. Finding out per witness reports if something was wrong with that overpass which we don't have official word on. But just making sure that it's sound and safe if it is since that would pose a huge problem for southbound I five.

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

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