AUGUSTA — The Goodwill store in Augusta was evacuated Tuesday morning after a box containing what police described as “possible military grenades and/or mortars” was discovered among donated items.

Augusta police and a Maine State Police bomb team responded, and the bomb team immediately secured the items, according to an announcement from the Augusta Police Department.

The state police determined a grenade found at the store was a spent training grenade. Two other pieces were fuses for artillery shells.

Shannon Moss, the public information officer for the Maine Department of Public Safety, said the bomb team was unable to determine at the Goodwill store if the fuses were hazardous, “so they took possession of them out of an abundance of caution for further analysis.”

Augusta police Chief Kevin Lully said no threats had been communicated, and police had no reason to believe there was ill intent by the person who had dropped off the box.

The incident was reported at 11:09 a.m. as a suspicious box at the store at 5 Senator Way.

Goodwill staff members met with Augusta police officers and decided to evacuate and temporarily close the store.

Morgan Sewall, the retail marking and communications specialist for Goodwill Northern New England, said Tuesday afternoon that the store was closed for about 90 minutes. It reopened after the bomb team deemed the situation safe.

Sewall said the grenade was identified during the sorting process for items that had been dropped off.

She said many New England residents collect antique weapons, but Goodwill asks that they not be donated to the organization. She said even if someone knows an item is antique and safe, this would probably not be clear to store employees, so such items are not accepted as donations.

“Unfortunately, this is oddly common,” Sewall said.

The store, which reopened early Tuesday afternoon, is at the Journal Square shopping center off Western Avenue.