(KRON) — Highway 84 near the 680 in Sunol has been reopened after a big-rig crash earlier shut down traffic in both directions. The big rig reportedly collided head-on with a Toyota Camry and then jackknifed.

A tour bus then apparently got stuck trying to turn around. The driver in one of the vehicles was reportedly trapped and could be heard calling for help. Helicopter transport was requested for one of the crash victims, but was refused until 9 a.m., possibly due to ongoing weather conditions.

A Sig-alert was issued by the CHP. It is not known at this time if the crash is weather-related. No details were immediately available from the CHP about whether anyone was injured in the crash.

Bay City News contributed to this report.