NAPA COUNTY -- American Canyon police want to know who is responsible for a racist letter targeting Filipinos that went viral on the Internet in recent days.

American Canyon Police Chief Jean Donaldson said Wednesday his office is investigating the letter, which appears to be on letterhead from the state agency overseeing beauty parlors. However, it is signed by "Concerned American Canyon Neighbors." It uses racially charged language to disparage a local salon owner, and Filipinos in general.

Though addressed to Maria Aida Ignacio Brandes of American Canyon, the letter, in which Filipinos are called "unwanted," "filthy" and "scum," was also evidently mailed to at least one other person in town. American Canyon resident Derek Valencia got one and posted it on Facebook. With his post, Valencia asked if anyone else got the letter. It wasn't immediately clear if they had.

For more on the story, see the Vallejo Times-Herald at http://www.timesheraldonline.com/news/ci_22345439