DANVILLE (CBS SF) — Authorities in the East Bay are investigating an officer-involved shooting in Danville Thursday where a man was shot by police after allegedly refusing to put down a knife, according to the Contra Costa County Sheriff’s Office.

The incident shut down traffic on a busy stretch of roadway straddling Interstate Highway 680 for hours.

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Thursday morning at around 11:48 a.m., police dispatch received multiple calls from motorists reporting a person who was throwing rocks off the Sycamore Valley Road overpass onto I-680.

According to the sheriff’s department, an arriving Danville police officer contacted the male subject in question near the intersection of Sycamore Valley Road and Camino Ramon.

Authorities said the officer approached the subject as he stood in the street. As the officer approached and attempted to to talk to him, the subject pulled out a folding knife and opened it.

Man with knife shot by Danville police (Contra Costa County Sheriff)

Authorities said the officer ordered him to drop the knife multiple times. The subject then advanced toward the officer, who discharged his weapon, striking the subject once.

The fire department and an ambulance were called and responded to the scene. The subject was taken to a local hospital where he is being treated at this time.

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The subject was not identified and there was no updated information about his condition.

Video of the scene shows police officers surrounding a dark grey pickup truck at the intersection of Sycamore Valley and Camino Ramon with blood on the ground next to it along with police evidence markers, debris, and other items.

Knife and evidence marker in Danville OIS (Contra Costa County Sheriff)

Danville police shut down Sycamore Valley Road between Brookside Drive and San Ramon Valley Blvd. for several hours.

That portion of the roadway includes an overpass over Interstate 680 at the Sycamore Valley Road exit. The California Highway Patrol said the northbound Sycamore Valley offramp was closed because of the police activity.

The roadway was eventually reopened at about 3:30 p.m.

The Contra Costa County Sheriff’s Office and the Contra Costa County District Attorney’s Office are continuing to investigate the incident.

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Anyone with any information is asked to contact the Investigation Division through dispatch at (925) 646-2441 or at (925) 313-2600. For any tips, email tips@so.cccounty.us or call (866) 846-3592 to leave an anonymous voice message.