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MANSFIELD, Mass. – The bomb squad was called to assist at a Massachusetts home when a family found a cannonball.

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The Mansfield Police Department shared a photo of the cannonball on its Facebook page, and said a family cleaning out the home of their deceased father, “an avid antique collector,” found what appeared to be a munition.

The family immediately contacted law enforcement, which brought in the bomb squad to conduct a controlled demolition, WFXT reported.

An X-ray of the munition revealed there was an unknown substance within it, which was why officials decided to detonate the cannonball at the state police range.

In a statement, Mansfield police said, “We want to apologize to our neighbors for the late-night noise,” WFXT reported. “If you ever come across something similar, whether it be a cannonball or just old ammunition, call us and we will come to you. Don’t drive it to us and definitely don’t walk into the station with it.”