The victim, Rodolfo Rodriguez, went for a walk around the block after dinner when a woman with a young child confronted him, KTLA reported.
"[They said] 'Go back to your country, why are you here?' Bad things", she said, quoting the witness.
Rodriguez's family told KTLA-TV that the woman from the photograph pushed Rodriguez to the ground, picked up a brick and began beating him with it.
Rodriguez is now recovering at home, according to NBC Los Angeles.
Misbel Borjas, a neighbor, witnessed the attack from her auto, she told the Los Angeles Times.
The eyewitness said she called the police and asked the mother why she attacked the man, and was told by the mother that Rodriguez had tried to touch her daughter. Rodriguez is a legal U.S. resident, according to Independent.
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"We are concerned, especially with the type of crime they committed", Deputy D'Angelo Robinson told the station.
Rodriguez's attack comes after the Department of Justice released its recent hate crime statistics, reported by KCRA.
Rodriguez suffered a bloodied and bruised face as well as a broken cheekbone and two broken ribs, reports Fox 11. Borjas tried to defend the man, but she said that the woman threatened her with a brick.
A 92-year-old man was attacked by five people, beaten with a brick, and told to 'go back to your country'. "What kind of threat does he pose to you, for you to do this to him?" "There was what appears to be a 4-year-old child there who witnessed the entire thing", he said. He said. "That's why we're still in shock, as you can see he's badly injured".
Mendoza created a GoFundMe fundraiser for his grandpa to help cover the cost of medical treatment. Though the initial goal for the GoFundMe was $15,000, the campaign has already surpassed $43,000 and is trending on the site.
According to the man's family, the battered grandfather was walking in the Willowbrook neighborhood when the unprovoked attack happened.
The police said they have one witness who can identify the woman, but that this witness might be unable to identify the other suspects.