A deputy discovered the device, believed to be a sea mine, at a beach in Lauderdale-By-The-Sea– about 30 miles north of Miami, according to the Broward County Sheriff’s Office (BSO).

The bomb squad and U.S. Air Force were called “out of an abundance of caution” after BSO determined it was a “possible military explosive device,” the sheriff’s office said in a statement.

A possible military explosive training device was discovered Sunday at a beach in Lauderdale-By-The-Sea (Broward County Sheriff’s Office)

Authorities said the device had “property of US Navy” and “INERT” written on it, but the device could have been used for military training purposes and may have been live at one point, the Sun-Sentinel reported.

Naval mines are typically used in the ocean as an explosive device to damage surface ships or submarines.

Parts of the beach where the device was found were temporarily closed off Sunday. It was later determined to be safe and was removed from the beach, the sheriff’s office said.

The beach has since reopened, authorities added, according to FOX 5 of Atlanta.

Army CID investigating missing DC National Guard rifle

An M4 rifle belonging to a D.C. National Guard unit is still at large following a training event at Fort A.P. Hill, Virginia, in March, according to Army Criminal Investigative Command.

Special agents are looking into the rifle’s disappearance, according to CID spokesman Chris Grey. Politico first reported on the missing weapon Thursday.

“To protect the integrity of the ongoing investigation, no further information will be released at this time,” Grey told Military Times, declining to confirm when special agents interviewed the Guard unit and whether there were any leads.

The rifle went missing after a March 11 training, Politico reported, and when unit leadership wasn’t able to locate it, CID took over, taking statements this week.

Missing equipment, particularly weapons, can bring military units to a stand-still. If it is discovered that weapons were purposely removed, not to mention intended for illegal use, troops can face serious legal consequences.

More than $1 million in weapons parts and sensitive military equipment was stolen out of Fort Campbell, Kentucky, and sold in a vast black market, some of it to foreign buyers through eBay, according to testimony at a federal trial this week.

In February, 10 pounds of plastic explosives went missing during a training exercise at Marine Corps Air Ground Combat Center Twentynine Palms, California, prompting the Naval Criminal Investigative Service to step in.

Last year, a Camp Lejeune, North Carolina, battalion commander and command sergeant major were fired after two of their units rifles went missing, never to be recovered.