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Dozens of schools in at least 10 states are on edge after receiving what police describe as sophisticated threats of bombings and mass shootings by phone.

As many as 15 schools in Massachusetts received such threats Tuesday, Fox 25’s Catherine Parrotta reported live from Waltham on Fox and Friends.

“And it’s not the first time in a matter of days that this has happened here in Massachusetts,” she said.

On Friday, about seven schools received similar threats.

Police say the threats are coming from automated robo-callers, where computerized voices appear on the line and warn of explosives and shootings.

Many students at these elementary and high schools were dismissed for the day after receiving the calls, while other kids were bussed to different schools.

Authorities are now trying to track down the callers to prevent another terror threat.

Watch more above.

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