SANTA CRUZ COUNTY — Two men were killed Thursday morning in a head-on crash on Highway 1 near Swanton Road, according to the California Highway Patrol.

The crash, which was reported to the CHP at about 7:43 a.m., occurred when the driver of a van traveling south on Highway 1 crossed the solid-double yellow line and crashed into a Chevy Tahoe traveling north, according to CHP Officer Trista Drake.

Both vehicles were traveling at about 60 mph at the time of the crash, Drake said.

The driver of the Chevy is a 33-year-old man from Watsonville and the driver of the van is a 61-year-old man from San Francisco, Drake said.

Two passengers in the Tahoe were taken to Valley Medical Center with “severe injuries,” Drake said.

Highway 1 was closed for about four hours from Scott Creek Road to the San Mateo County line, according to the CHP.

The CHP does not know why the van crossed the double lines, Drake said. Drugs or alcohol are not suspected to have been factors in the crash, which remains under investigation.