WASHINGTON (KABC) -- Students at Los Osos High School in Rancho Cucamonga were among those in several states who received racist text messages in the days after the 2024 election, prompting investigations by the FBI and other authorities.
As of 4 p.m. Thursday, cellphone users in at least a dozen cities -- Los Angeles, Rancho Cucamonga, New York, Atlanta, Charlotte, Raleigh, Houston, Huntsville, Texas, Norfolk, Virginia, and Tuscaloosa, Alabama -- reported receiving the messages.
"We wanted to inform you about a recent incident involving a post on social media which included racially motivated language," Eric Cypher, principal at Los Osos High School in Rancho Cucamonga, said in a statement. "This message was then sent to a few students through a text message. After further investigation, we have found that this message is part of a larger, nationwide trend of disruptive content being shared.
"We are in communication with local law enforcement to monitor these situations and ensure our school remains a safe and positive environment," Cyhper said. "As a campus and community, we will not tolerate the use of racial slurs and culturally insensitive language."
The messages, sent anonymously, generally used a similar tone but varied in wording.
Some instructed the recipient to show up at an address at a particular time "with your belongings," while others didn't include a location. Some of them mentioned the incoming presidential administration.
It wasn't yet clear who was behind the messages and there was no comprehensive list of where they were sent, but high school and college students were among the recipients.
The FBI said in a statement that it is "aware" of the suspicious messages and "is in contact with the Justice Department and other federal authorities on the matter."
"As always, we encourage members of the public to report threats of physical violence to local law enforcement authorities," the agency said.
A spokesperson for the Federal Communications Commission said in a statement, "Our Enforcement Bureau is aware of these and is looking into them alongside federal and state law enforcement."
Civil rights organization NAACP condemned the messages, saying they will fight against letting hateful rhetoric be "normalized."
"These messages represent an alarming increase in vile and abhorrent rhetoric from racist groups across the country, who now feel emboldened to spread hate and stoke the flames of fear that many of us are feeling after Tuesday's election results," the organization said.
Tasha Dunham of Lodi, California, said her 16-year-old daughter showed her one of the messages Wednesday evening before her basketball practice.
The text not only used her daughter's name, but it directed her to report to a "plantation" in North Carolina, where Dunham said they've never lived. When they looked up the address, it was the location of a museum.
"It was very disturbing," Dunham said. "Everybody's just trying to figure out what does this all mean for me? So, I definitely had a lot of fear and concern."
Her daughter initially thought it was a prank, but emotions are high following Tuesday's presidential election. Dunham and her family thought it could be more nefarious and reported it to local law enforcement.
"I wasn't in slavery. My mother wasn't in slavery. But we're a couple of generations away. So, when you think about how brutal and awful slavery was for our people, it's awful and concerning," Dunham said.
ABC News contributed to this report.