At least four people died Saturday when a bus carrying some Dallas Cowboys staffers collided with a van on a northwestern Arizona highway.

Arizona Department of Public Safety spokesman Quentin Mehr said that the fatalities were passengers in the van. None of the bus occupants were injured. There were no players on the bus.

"All on the bus came through OK with some bumps and bruises," Cowboys spokesman Rich Dalrymple said in an email.

Dalrymple said the bus was only carrying members of the franchise's staff but would not say how many. There were no players on board.

The two vehicles collided in the afternoon on U.S. 93, about 30 miles north of the city of Kingman, according to DPS.

The crash shut down at least one lane of the highway that serves as the main route between Phoenix and Las Vegas.

The bus was on its way to a Dallas Cowboys fan event in Las Vegas. Charles Cooper, manager of GameWorks entertainment center in Vegas, said the session with 50 to 75 fans was scheduled for 3 p.m. PDT. People were already waiting when the president of a Las Vegas Cowboys fan club called to relay news of the accident.

The event was subsequently canceled. Cooper says the team mascot was supposed to appear.

After the Las Vegas stop, the bus was scheduled to go on to Oxnard, California for the team's training camp.

Members of the organization typically take a bus two weeks before the camp starts and make stops along the way.

The Associated Press contributed to this report.