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​KINGMAN, Ariz. -- Four people were killed Sunday when a bus carrying Dallas Cowboys staffers but no players collided with a van on a northwestern Arizona highway.
The fatalities were people in the van (three female passengers and one male), Arizona Department of Public Safety spokesman Quentin Mehr said. He did not release their identities.
"An accident involving loss of life is tragic," Cowboys owner Jerry Jones said in a statement Monday. "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."
The bus occupants were uninjured.
"All on the bus came through OK with some bumps and bruises," Cowboys spokesman Rich Dalrymple said Sunday in an email.

Dalrymple said the bus was only carrying members of the franchise's staff but would not say how many.
Among those on board the team bus were DallasCowboys.com columnist Mickey Spagnola, a team mascot and a team videographer.
The two vehicles collided in the afternoon on U.S. 93, about 30 miles north of the city of Kingman, according to Mehr. The van was turning left at an intersection when it collided with the Cowboys' bus.
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. PT. People were already waiting when the president of a Las Vegas Cowboys fan club called to relay news of the crash. The event was subsequently canceled. Cooper said 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.

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Today's question: Are the Dallas Cowboys better or worse without Greg Hardy?
Dan Graziano, New York Giants reporter: They're better OFF, but not better. Which is to say it was the right decision to let Hardy go but the wrong decision not to do more to try to find pass-rushers to replace him. I know Hardy didn't perform at a high level last year and that's one of the main reasons he's gone. But with Randy Gregory and Demarcus Lawrence facing suspensions to start the year, the Cowboys needed at least one more body to replace Hardy at defensive end, and they didn't do enough to fill that void. So while the Cowboys' locker room and meeting rooms might be more pleasant places to be with Hardy gone, he leaves behind a lot of questions about who's going to sack quarterbacks for them.
Phil Sheridan, Philadelphia Eagles reporter: Talent-wise, I think the Cowboys are worse without Greg Hardy. Whatever else you say about him, the man is a pretty good football player. Hardy had one of his six sacks in his only game against the Eagles last season, so I guess I came away impressed. But overall, I think the Cowboys will be better off. Any player that disrupts team chemistry is a problem. I covered the Eagles through the Terrell Owens debacle, and I know, Todd, that you covered him in Dallas. The Eagles weren't a more talented team without Owens the wide receiver, but they were better overall without Owens the disruption.
John Keim, Washington Redskins reporter: Better from a distraction standpoint. But the Cowboys still lack a pass-rush and miss what a guy with Hardy's talent can do. The problem is Hardy didn't give them a whole lot last year and was not the same player he was in Carolina. Against the Redskins in the regular-season finale, Hardy needed two sacks to receive a $500,000 bonus. With left tackle Trent Williams sidelined that day, all Hardy had to do was beat backup Ty Nsekhe, but he was shut down. From afar, and strictly from a football standpoint, Hardy seemed to have other issues in terms of being a professional. So to me, they've rid themselves of a distraction and an underperforming big name. Their real issue is losing Demarcus Lawrence (who seemed to play well) and Randy Gregory (who had little impact) to suspensions. Dallas needs more defensive talent, but not Hardy. It'll also be tough to measure his loss considering quarterback Tony Romo is back and running back Ezekiel Elliott could have a big impact, allowing Dallas to play like they did in 2014, focusing on ball control and an opportunistic defense to make up for a lack of big-time talent.

IRVING, Texas -- The time has come for the Dallas Cowboys to cut ties with linebacker Rolando McClain.
On the field, he has shown that he's a playmaker in his two seasons with Dallas, but he has not shown the discipline required off the field to earn the right to play in the league or for the Cowboys.For the second straight year, McClain will be suspended to start a season due to violating the NFL's substance abuse policy, according to sources. This time it's 10 games. Last year it was four.

This is different than cases involving DeMarcus Lawrence or Randy Gregory, who will miss the first four games on suspension. They are on their second chance with the Cowboys. There is something to be salvaged with them. If they run afoul of the policy again, then the Cowboys need to part ways with them too.McClain has had his fair share of chances.
He has used them all. At least with the Cowboys.If another team wants to take a chance, good luck.As talented as he is, he is just not worth it. It took the Cowboys 12 games to realize that with Greg Hardy last year. They don't need to wait longer on McClain.
The Cowboys gave him a job when nobody else would in 2014. They stood by him last year when he was suspended four games. Jerry Jones stood by him this offseason when he skipped voluntary workouts because his kids live in Alabama.
Other players have kids who live in different states, yet they managed to make it to every workout, every organized team activity and the mandatory minicamp.
For two years the Cowboys have let McClain operate largely on his own terms. If he didn't want to take part in individual drills, he would watch. Teammates notice. He took part in the early part of this offseason program and was in woeful condition. Soon thereafter, he returned to Alabama and came back for the mandatory June minicamp in woeful condition.
He was not allowed to practice but went through individual drills.
The Cowboys were short-handed at linebacker the entire time because of surgeries to Sean Lee and second-round pick Jaylon Smith, and minor bumps and bruises suffered by other linebackers. That didn't go unnoticed, either.
The longer McClain is around, the longer it strains what coach Jason Garrett has attempted to build: a team committed to and accountable to each other.
If the Cowboys cut McClain, they are out the $750,000 signing bonus he received in March. If he remains on the team, they could recoup the money. In the NFL landscape, $750,000 is a pittance.
The Cowboys aren't as talented without McClain, but there comes a time when talent goes only so far. The Cowboys tried with McClain. He has cared about game days. He hasn't cared much for any other day. The Cowboys made special rules for players like Michael Irvin, Deion Sanders and others. They were worth it.
The Cowboys might not be better without McClain, but they will be better off without him.
Todd ArcherESPN Staff Write