Semitrailer slams into commuters, killing at least 1

Police said an out-of-control semitrailer slammed into commuters stopped in a traffic jam in Colorado, causing a chain-reaction and engulfed at least 12 cars and three semis.
2:06 | 04/26/19

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Transcript for Semitrailer slams into commuters, killing at least 1
We turn to that deadly pileup in Denver turning an interstate into an inferno. A semi blasting past drivers slamming into cars and trucks killing at least one person, injuring six more. Clayton Sandell is there on the scene with the latest. Good morning, Clayton. Reporter: Good morning, Cecilia. You can see behind me here there is no traffic on this major interstate this morning. I-70 is completely shut down except for emergency vehicles and authorities say overnight that multiple people were killed in this crash but they still don't know how many or why this happened. There is a complete fire, things are exploding. Reporter: Rush hour interstate inferno. Oh, my god. Reporter: Explosions and raging fire in the middle of the Thursday evening commute. After police say an out-of-control tractor trailer slammed into commuters stopped in a traffic jam. You can see a car, outline of a car right there. Reporter: That speeding semi captured on Josh Mccutcheon's live stream camera. Oh, my god. I've never seen that many cars and that much destruction and fire and it was just complete chaos. Reporter: The chain reaction disaster engulfing at least 12 cars and three semis on interstate 70 near Denver. Six people rushed to hospitals. So much carnage, police don't know how many people are dead. We are still, still working on identifying those people that were killed and we're also still trying to account for everybody involved in the crash. Reporter: Investigators now reviewing this video, they're eager to talk to the driver of that semi who survived. Police want to know why the truck was going so fast and why it did not stop. Now, one of the big problems here is the intense heat from this fire not only damaged the highway pavement, it also may have compromised the safety of this overpass behind me. They're worried it could come down so there is a lot of work that needs to be done here before this interstate re-opens. George. That was amazing. Okay, thanks very much.

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

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