TERRE HAUTE, Ind. (WTHI) – An Indiana radio station was apparently hacked Sunday evening.

If you were tuning in to WXXR 97.3 in Terre Haute, you might have heard a message from “Anonymous.”

“Anonymous” is an activist group that hacks websites, to express their views and messages.

Around 7:30 p.m. Sunday, the FM signal was intercepted and a broadcast message intended for the American people played. It broadcasted for 30 minutes, then returned to the music playlist. Station officials say, they’re just thankful the music was turned back on.

Doug Kirkman, with WXXR spoke with News 4’s sister station, News 10. Kirkman stated, “We are unaware of where the broadcast origin is. It did actually appear to be coming underneath our actual signal. When we looked at our computers and everything at the broadcast station, everything appeared normal though it was quite obviously not normal.”

The radio station is investigating this hacking.