Erin Van Horn was reportedly distracted when the crash occurred. The distraction is considered a factor but not the sole cause of the crash

A crash in central Oklahoma killed a mother and three children on July 17.

Erin Van Horn, 40, was distracted when her SUV rear-ended a tractor trailer, according to a new report.

The crash resulted in the deaths of Tulsa-area residents Van Horn; her 10-year-old son, Zac Van Horn; 13-year-old Elizabeth 'Lizzy' Edwards; and 11-year-old Beck Kitterman.

Lauren Van Horn and Isabella 'Izzy' Kitterman, both 13, were critically injured and hospitalized in Oklahoma City. Samantha Van Horn, 7, was treated and released the day of the accident.

The children all knew each other from their soccer team in Tulsa.

The group was heading back from a summer outing at Turner Falls Park when the crash occurred.

The two boys were not wearing seatbelts. It is unclear whether the other passengers were.

The new report does not detail what distracted Erin Van Horn. It cites her inattention as an 'unsafe/unlawful contributing factor' but not the specific cause of the crash.

Zac Van Horn, 10, (left) and Beck Kitterman, 11, (right) were not wearing seatbelts when the SUV crashed. It is unclear whether the other passengers were wearing seatbelts

Elizabeth 'Lizzy' Edwards, 13, (right) died in the hospital following the crash. All of the children played soccer together for years in Tulsa

Four passengers were killed when an SUV collided with a tractor-trailer that was stopped due to construction traffic on I-35 just south of Oklahoma City on July 17

The interstate was narrowed to one lane each direction because of construction. The tractor trailer was stopped in traffic.

The report states 'no improper action' on behalf of the truck driver 45-year-old Arash Zarezadeh, who was not hurt.

GoFundMe pages were created for the Van Horn and Kitterman/Edwards families. The Van Horn page has raised $137K and the Kitterman/Edwards page has raised $87K.