WASHINGTON — Several federal and state agencies are investigating how racist mass texts were sent to Black people across the country in the wake of the presidential election this week.

The text messages invoking slavery were sent to Black men, women and children, prompting inquiries by the FBI and other law enforcement departments.

The anonymously sent messages were reported in several states, including New York, Alabama, California, Ohio, Pennsylvania, Maryland and Tennessee. The FBI said it has communicated with the Justice Department about the messages, and the Federal Communications Commission said it is investigating alongside federal and state law enforcement.

“These messages are unacceptable,” said a statement from FCC Chair Jessica Rosenworcel. She said the agency takes “this type of targeting very seriously.”

While the texts varied somewhat, they all instructed recipients to “board a bus” that would transport them to a “plantation” to work as slaves, officials said. They said the messages were sent to school-aged children and college students, causing significant distress.

Whoever sent the messages used a VPN to obscure their origin, Louisiana Attorney General Liz Murrill said Thursday morning.

Maryland Attorney General Anthony Brown said his office is fielding multiple reports of racist text messages being sent to Black residents, including children. Officials said the messages appear to be part of a nationwide campaign targeting Black people in the wake of the election.

“These messages are horrific, unacceptable, and will not be tolerated,” Brown said in a statement.

Brown said in an interview that it’s disturbing that children were targeted, sometimes by name, in mass texts that typically rely on datasets collected on adults, such as campaign donors or magazine subscribers.

“This is an intimidating, threatening use of technology” that likely violated multiple laws, Brown said. He said investigators will use “all the tools and resources available to us to hold accountable whoever is behind these text messages.”

Phone service provider TextNow said that “one or more of our accounts” were used to send the racist text messages and that it quickly disabled those accounts for violating its terms of service.

“As part of our investigation into these messages, we learned they have been sent through multiple carriers across the US and we are working with partners and law enforcement cooperatively to investigate this attack,” the Canada-based company said in a statement Friday.

Major providers AT&T and Verizon both said it was an industry-wide problem and referred comment Friday to the CTIA, a wireless communications trade group.