A Boston man accused of threatening to blow up an Orange Line train while wearing a Guy Fawkes mask this morning has been arrested and will be arraigned on a charge of making a false bomb threat tomorrow, officials say.

Transit police were notified around 9 a.m. that a man wearing a mask who was riding an Orange Line train between the Downtown Crossing and Tufts Medical Center stations was making "threatening statements" and even referenced "blowing the train up," according to police.

After reviewing the MBTA's public safety camera system, transit cops say they were able to track down Joseph Johnson, 30, outside the Tufts Medical Center station around 11 a.m., where he was arrested.

"We take incidents such as these with the utmost urgency and seriousness," transit police spokesman Lt. Richard Sullivan said in a statement. "Our number one priority is the safety and security of our patrons and employees. We will work with the Suffolk County District Attorney's Office to ensure Johnson is held accountable for his actions."

Johnson is expected to be arraigned tomorrow at Boston Municipal Court.

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