SALT LAKE CITY (AP) — Hospital officials say three Chinese tourists remain in critical condition from injuries suffered in a deadly tour bus crash near a national park in southern Utah.

Intermountain Healthcare officials said Monday that one other person is in serious condition and eight others are in fair condition.

The update indicates improvements for two patients who were in critical condition on Saturday and six who were in serious condition.

Four people died and all 30 passengers were injured the tour bus rolled over into a guardrail Friday near Bryce Canyon National Park.

U.S. officials investigating the crash’s cause say the bus driver was making his first trip. They haven’t determined the cause.

A Chinese-based travel company on Monday defended its licensing and the bus driver who was at the wheel.