Four children have been hospitalized after a crash on State Route 51 just south of Shea Boulevard, according to Phoenix fire officials.

They are all in serious but stable condition.

The children's father, who was in the SUV with them, refused transport to the hospital, as did a pregnant woman in another vehicle.

The children's ages are 10, 10, 5 and 3.

The Arizona Department of Public Safety is investigating the crash.