SAN DIEGO (CBS 8) - San Diego police are investigating a head-on crash in San Pasqual.

It happened around 12:30 p.m. several miles east of the San Diego Zoo Safari Park on San Pasqual Valley Road.

Police say a red Honda drifted into the eastbound lane and struck a van. The driver of the Honda was taken to the hospital with a broken leg and internal injuries. The driver of the van complained of rib pain.

Police found a loaded semi-automatic pistol inside a bag in the Honda. Officers are investigating if drugs or alcohol may have been involved.