SALISBURY, Mass. (AP) – Authorities on Tuesday destroyed a cache of “military-type” ammunition and explosives which was discovered by police serving a drug warrant at a Salisbury home, authorities said.

The munitions included grenades, dynamite, land mines and 81 mm shells, officials said Tuesday. It was not immediately clear if the munitions were live. They were destroyed at an isolated beach Tuesday afternoon, according to the Essex District Attorney’s office.

Police arrested David Plonowski, 44, at his house at 28 Pike Street on Monday night, according to Steve O’Connell, a spokesman for Essex District Attorney Jonathan Blodgett.

Police searching the house for drugs contacted the state police bomb squad after discovering the explosives. State police called in the Military Response Team in Newport, R.I., after realizing the size of the cache.

The number of munitions discovered and why they were collected was unclear. Salisbury police did not immediately return calls for comment.

Plonowski pleaded not guilty at his arraignment in Newburyport District Court on Tuesday on charges of cocaine trafficking, carrying a firearm without a license and use of a firearm while committing a felony.

He was ordered held without bail pending a dangerousness hearing scheduled for April 17.

His bail was also revoked on another case in which he’s charged with assault and battery and assault with a dangerous weapon.

Plonowski’s attorney did not immediately return a call for comment.

Salisbury is 42 miles north of Boston on the New Hampshire border.