Contractors in Waltham, Massachusetts uncovered cannonballs during a dig late Monday morning, prompting a response from the police bomb squad and the fire department. 

The Waltham Fire Department notified the State Police Bomb Squad around 11 a.m. Wednesday that a construction worker had uncovered what appeared to be an "unexploded military ordinance" while excavating a trench at a job site. 

cannonballs waltham ma

Officials say 13 cannonballs were discovered at the construction site.  (Massachusetts Department of Fire Services)

ATF personnel and a state Hazmat team responded over concerns of environmental hazards, though none were ultimately detected. 

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The Department of Fire Services tells Fox News Digital that items were determined to be cannonballs, all in various sizes. 

Bomb techs conducted visual inspections and interviews at the scene. A heavy equipment operator was able to dislodge several more cannonballs from a pipe in the trench. Officials inspected the surrounding area for other possible ordnance but found none. 

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Wearing personal protective equipment, bomb technicians were able to remove 13 pieces of ordnance from the scene and take them to a safe location. The Waltham Fire Department and Waltham Police Department countercharged the items without incident.