A text messaging service reported on Friday that it had identified “one or more” users allegedly responsible for sending racist text messages nationwide and promptly shut down the offending accounts.

TextNow, a mobile provider that offers free phone numbers, confirmed to ABC News that it is cooperating with law enforcement and condemned the offensive messages sent to users this week.

The messages, reported in at least 14 states, instructed recipients they would be taken to a plantation to “pick cotton” and appeared to target Black users, ranging from teenagers to adults, according to investigators. The texts addressed recipients by name.

Once notified of the accounts allegedly responsible, TextNow disabled them within an hour. “In our investigation, we found that the messages were sent through multiple carriers across the U.S., and we are working closely with partners and law enforcement to investigate this attack,” a company representative stated.

“We do not tolerate the use of our service to harass or spam others and will work with authorities to prevent these actions in the future,” the representative added.