A woman was arrested late Tuesday in the beating of a 92-year-old man in Los Angeles County in which the attacker reportedly told the man to “go back to Mexico.”

The beating left him bloodied, bruised and bewildered about why he was attacked.

The woman, Laquisha Jones, 30, of Los Angeles, was charged with assault with a deadly weapon, according to the Los Angeles County Sheriff’s Department, and was held on $200,000 bail.

A witness, Misbel Borjas, told CNN and other news organizations that the attacker used a brick in the beating of the man, who was identified by the authorities as Rodolfo Rodriguez. Several men soon joined in the attack.

The beating occurred around 7:30 p.m. on July 4 in an area of unincorporated Los Angeles County, a statement from the sheriff’s department said. It’s known as Willowbrook and is about 15 miles south of downtown Los Angeles. Mr. Rodriguez, who was visiting the area, was hospitalized for several hours, and is now recovering with family, the statement said.