CASTRO VALLEY (CBS SF) — Alameda County authorities on Friday confirmed the arrest of a female Amazon delivery driver who allegedly assaulted a woman in Castro Valley during a confrontation.

The incident happened Thursday, according to the Alameda County Sheriff’s Office. Deputies took 21-year-old Amazon delivery person Itzel Ramirez into custody after receiving a 911 call from a 67-year-old woman who said the Amazon driver punched her at least 10 times in the face and head.

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According to deputies, the incident happened on the 22200 block of Center Street in Castro Valley when the victim and the driver had a verbal confrontation where the victim used an expletive to describe the driver before the assault.

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The driver told deputies she hit the woman in self-defense. Ramirez was arrested on suspicion of felony battery causing serious bodily injury and felony elder abuse and booked at Santa Rita Jail.

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Authorities said her bail was set at $100,000.