OAKLAND — The woman accused of driving a U-Haul truck at security personnel outside Coast Guard Island last month — moments before authorities unleashed a fusillade of bullets at the vehicle — was formally charged Tuesday in the chaotic encounter.

Bella Thompson, 26, made her first appearance in an Oakland federal courtroom, when prosecutors unsealed a single charge of assault on a federal officer with a deadly or dangerous weapon. If convicted, Thompson could face up to 20 years in prison.

Thompson — an active member of Oakland’s queer art community, as the founder of an art collective that routinely staged open mic nights and other workshops in the East Bay — said little during the hearing. Appearing shackled in black jeans and a black hoodie, Thompson said only “Yes, your honor,” when

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