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

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