FARGO — As millions of people use Zoom conferences for online meetings, tech experts are warning the public about "Zoom bombers" — people who get into a zoom conference they're not supposed to be in.

"Bombers" will often disrupt calls with profanity or offensive images.

It happens when the meeting pin number is posted online. Zoom call attendees typically gain access to calls by typing in a pin number for the conference. They may also have a password.

Jeremy Straub, a computer science professor at North Dakota State University, said this can be avoided by scheduling meeting times with a unique pin and by double-checking attendees.

"If you notice that they're out of place, or even better if you go through and check who each person is and why are they there, you would determine this person doesn't need to be here," Straub said. "Maybe they wandered in by accident, maybe they've come in here with a nefarious purpose."

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Straub said it can help to greet new chatroom attendees.

"When somebody just comes into the meeting, just welcome them ... listen a little bit. Make sure it sounds like the person you're expecting," he added.

Straub said he is also hearing more reports of "Zoom bombers" quietly listening into calls to get private information.