A box truck collided with a big rig in unclear circumstances. The events leading up to the accident were not immediately established

Contra Costa, CA. – Authorities are investigating a serious injury two-vehicle collision on State Route 4 in Contra Costa Wednesday morning.
According to the California Highway Patrol, the wreck happened at around 5:51 a.m. on the eastbound Highway 4 just east of Hillcrest Avenue off-ramp.
A box truck collided with a big rig in unclear circumstances. The events leading up to the accident were not immediately established.
One person sustained severe injuries and was transported to the hospital for treatment.
More information about the crash was not provided.
An investigation is underway.
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