4 people killed in a tour bus crash in Bryce Canyon International Park in Utah

Officials say the bus lost control when making a slight turn and crashed into a guard rail, which caused it to roll over.
2:04 | 09/21/19

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Transcript for 4 people killed in a tour bus crash in Bryce Canyon International Park in Utah
Now to that tour bus tragedy. At least four people killed near Bryce canyon national park in Utah. You can see the extensive the bus completely mangled. Its roof collapsed. Now the efforts under way to pinpoint the cause of this deadly crash. ABC's will Carr is in St. George, Utah, with what we know so far. Good morning, will. Reporter: Eva, this crash happened in an isolated part of the state. The victims were taken to four hospitals in the area. Some were even airlifted here to St. George as the first responders rushed to save their lives. This morning a horrifying look at a fatal Utah tour bus crash that left four people dead and as many as 15 with critical injuries. This is a tragic scene. Reporter: The NTSB sending a ten-member team to the crash site to launch its safety investigation. The bus driving eastbound on state route 12 near Bryce canyon national park Friday afternoon. Officials say the bus lost control when making a slight turn then crashed into a the collision caused the bus to roll over ejecting passengers. The force of the crash nearly sheared off the roof of the bus. The windows completely shattered. Skid marks paint the road. And luggage littering the roadside. All 30 people on board including the driver suffered injuries. Three helicopters airlifted some of the passengers to area hospitals while emergency crews and bystanders worked together to triage victims. When you're one of the first to see something like that before anybody comes, just the debris and the people laying everywhere and the confusion, the blood. Reporter: The tourist group was made up of Chinese nationals. The bus' whereabouts, what the bus driver was doing, any possible incidents with faulty equipment on the bus itself, we'll be doing a lot of investigating as to the cause of this incident. Reporter: As the NTSB investigates that cause, the Chinese embassy is thanking all of those first responders for everything they did to help. Whit. An awful crash. Will, thank you.

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

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