SAN DIEGO, CA – One person was killed in a wrong-way crash on Interstate 5 in downtown San Diego Sunday afternoon, a fire official said.

California Highway Patrol dispatchers were first alerted to the crash at 4:06 p.m. on southbound I-5 just before state Route 163.

A black sedan and a white minivan reportedly hit each other head-on. The collision left the driver of one car dead, and one person was trapped inside the other car, San Diego Fire-Rescue Battalion Chief Rick Ballard said.

It wasn’t immediately clear which car was traveling the wrong way. One of the vehicles exploded after the crash, dispatchers were told.

Firefighters were blocking three lanes of southbound I-5 near the accident scene, according to the CHP.