Rosa Murillo, 26, pleaded not guilty in Eastern Hampshire District Court to charges of armed robbery and making a bomb threat, the Northwestern District Attorney's Office said.
Prosecutors allege Murillo entered the Westfield Bank on Willimansett Street on Wednesday, Dec. 11, and demanded $5,000, warning the teller that a bomb would go off if her demands were not met.
The alarming incident prompted a multi-department investigation, which culminated in Murillo's arrest by Amtrak Police in Springfield on Friday night.
Judge Bruce Melikian ordered Murillo held without bail under the dangerousness statute.
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