The Massachusetts State Police bomb squad was called to the Condon Shell in Medford on Saturday afternoon after a military ordnance was located there.
Medford police initially said just before 3 p.m. that they were investigating a suspicious device found in the area of the recreational venue, asking everyone to stay away until further notice.
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State police confirmed patrols and bomb squad technicians were on scene at Mystic Valley Parkway (Route 16) for a military ordnance, announcing the west side of the parkway was temporarily closed from Main Street to Winthrop Street.
Pictures shared on social media by state police appear to show a mortar shell. Medford police said the device was removed and determined to be inert.
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The street has since reopened, though crime scene tape was still up along Route 16 later Saturday.
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Medford residents told NBC10 Boston it was an odd thing to occur.
"I feel like if somebody places something like that by a site like that, they want some type of notice, some type of attention," one man said.