UVALDE COUNTY, Texas - The National Transportation Safety Board released a preliminary report Thursday into the deadly crash between a New Braunfels church bus and pickup truck.

The incident left 13 people dead and two injured, including the driver of the white Dodge Ram pickup truck that caused the crash.

As KENS 5 reported, the crash happened on March 29 in Uvalde County.

The driver of the truck involved in the crash, 20-year-old Jack Dillon Young, provided a statement during an NTSB interview that he was checking his phone for a text when the accident occurred.

The NTSB said it has subpoenaed the driver’s cell phone records from his service provider and "will review them over the coming weeks."

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Young also reportedly told NTSB investigators he had been taking prescription medications prior to the crash.

As KENS 5 reported, several of those medications, as well as marijuana, were found in the pickup truck at the scene of the crash. Toxicology test results are pending, according to the NTSB.

Preliminary evidence also indicates that all the occupants on the church bus were wearing seatbelts.

The NTSB said two witnesses recorded a 14-minute video of the pickup truck before the crash happened, showing the truck swerving more than 50 times and completely traveling to the wrong side of the road on Highway 83 near Concan, Texas.

The crash remains under investigation, and the NTSB said it is working alongside the Texas Department of Public Safety.