Two adults are dead and three children in critical condition following a rollover collision along northbound Interstate 35 in San Marcos Saturday.

The five adults and five children traveling in the 2002 Ford Explorer were said to be from San Antonio and en route to a family gathering in Austin.

At approximately 8:42 p.m. near the 200-mile marker, witnesses told San Marcos Police the SUV left the roadway and rolled multiple times before landing on the access road. Only the driver, identified as Tam...