A man allegedly armed with a knife was fatally shot by Santa Clara County sheriff's deputies following a traffic stop and hours-long standoff Monday evening, authorities said.

According to the sheriff's office, deputies stopped a vehicle near Fruitdale and Leigh avenues shortly before 7:30 p.m. Deputies said the driver began to behave "erratically", refused to comply with commands and barricaded himself inside his car.

Over the span of more than two hours, deputies said they gave repeated verbal commands and attempted to de-escalate the situation. The Sheriff's Psychiatric Emergency Response team was also brought to the scene.

The sheriff's office said the driver continued to ignore de-escalation efforts, prompting deputies to deploy less-lethal tools and projectiles.

Deputies said the driver eventually exited the vehicle with a knife and charged towards deputies. At least one deputy opened fire and struck the man.

Following the shooting, deputies and paramedics performed life-saving efforts. The suspect was taken to a hospital where he succumbed to his injuries and was pronounced deceased at 10:16 p.m., according to the sheriff's office.

Authorities did not release the man's name.

"Our personnel utilized every available resource to de-escalate the encounter safely and effectively in hopes of a peaceful resolution," Sheriff Robert Jonsen said in a statement. "We recognize the profound gravity of any use-of-force incident. Our commitment remains steadfast to preserving life, ensuring the safety of our community, and upholding the integrity of our response."

In an update Tuesday afternoon, the sheriff's office said two deputies discharged their firearms. One deputy is a 24-year veteran of the sheriff's office, while the other deputy has been with the office for nine years, with both of them receiving "extensive training" in crisis response.

The sheriff's office has not released the deputies' names.

Deputies said San Jose Police is leading the investigation. In addition, the Santa Clara County District Attorney's Office will conduct an independent review.

"A full and transparent review is in progress," Jonsen added. "Our thoughts are with all those impacted, including the deputies involved, who acted under intense and challenging circumstances."