The southbound lanes of Interstate 35 in San Marcos were shut down for about an hour early Thursday in the wake of a collision between a passenger vehicle and a dump truck that killed two people.

The 204B exit off I-35 was closed for several hours as wreckage was cleared and investigators worked the scene.

According to a press release, the crash occurred at approximately 2:45 a.m. at the 204B exit when a dump truck ran into the back of the passenger vehicle, which is believed to have stopped or sl...