Authorities: Van failed to yield right of way in crash with Cowboys' bus

Investigators have concluded that the van involved in the fatal accident with a Dallas Cowboys bus on Sunday failed toyield the right-of-way from a stop sign and then was struck.

The four people in the van killed in the accident were identified Tuesday as Chinese nationals who were visiting the United States. Names of the deceased haven't been released but Arizona Department of Public Safety said a 52-year-old male was driving. Two of the passengers were 52-year-old females and a third passenger was a 19-year-old female. All were wearing their seat belts, authorities said.

The bus was carrying Cowboys staffers but no players, authorities said Monday. It was on its way to a Cowboys event with 50 to 75 fans in Las Vegas set for Sunday afternoon, which was canceled after the accident.

The accident took place on U.S. 93, the main route between Las Vegas and Phoenix.

On Monday, Cowboys owner Jerry Jones called the loss of life tragic.

"We as an organization are deeply saddened, and our thoughts, prayers and concerns at this time are with the family members and loved ones of all who were lost,'' he said in a statement issued by the team.

The Associated Press contributed to this report.