UVALDE, Texas (AP) -- Thirteen people were killed and two others were injured Wednesday when a van carrying 14 church members and a pickup truck collided on a two-lane Texas highway.

The group of senior adults from First Baptist Church of New Braunfels, Texas, was returning from a retreat when the crash occurred, a church statement said. The vehicles collided about 12:30 p.m. on U.S. 83 outside Garner State Park in northern Uvalde County, said Texas Department of Public Safety Sgt. Conrad Hein. The area is about 75 miles (120.7 km) west of San Antonio.

It wasn't immediately clear if the lone person in the pickup truck was among the victims killed or how many of the church members are among the dead, Hein said. The cause of the crash also hasn't been determined, he said.

Photos and video of the scene showed heavy damage to the front drivers' sides of the small white church van and the pickup truck. The vehicles appeared to have collided on those sides of the vehicles.

The back of the van was up on a guardrail and debris was scattered onto the grass below.

Church officials said in a statement on the First Baptist website that the members were returning from a three-day retreat at the Alto Frio Baptist Encampment in Leakey, about 9 miles (14.5 km) north of where the crash happened.